Complexe paysager de Trang An

Country
Viet Nam
Inscribed in
2014
Criteria
(v)
(vii)
(viii)
The conservation outlook for this site has been assessed as "good with some concerns" in the latest assessment cycle. Explore the Conservation Outlook Assessment for the site below. You have the option to access the summary, or the detailed assessment.
© IUCN/Graeme Worboys

Summary

2025 Conservation Outlook

Finalised on
11 oct 2025
Good with some concerns
The values of the property appear likely to be sustained in the future. A series of concerns were noted previously regarding the state of conservation of the property, which have resulted in actions being taken, especially following the 2019 Reactive Monitoring Mission. The growth of visitor numbers, and urbanization remain significant threats but has been tackled through a series of measures. It will be crucial that this progress is maintained and the engagement of local communities is further strengthened. The establishment of a reintroduction project for the Delacour’s Langur, with successful initial results, shows that there remains the ability to manage intensive visitor use alongside the maintenance and enhancement of nature conservation values. There is exemplary engagement of international support in the site. The management of the show caves, and assuring high standards of lighting and display warrant further consideration to ensure that all of the highest standards are being maintained, as would a review of the impacts of telecommunications masts.

Current state and trend of VALUES

Low Concern
The values of the property appear likely to be sustained in the future. A series of concerns have been noted previously regarding the state of conservation of the property since inscription, which have resulted in actions being taken, initially including a minor boundary modification in 2016. A large range of concerns were identified in the 2019 Reactive Monitoring Mission and actions taken since the mission have restored the loss of attributes of the nature conservation value that were reported by the mission and led to a greatly strengthened management framework and capacity. It can be assessed that there is a low concern on the outlook for the nature conservation values of the property, and that the situation now appears to be stable, and with further prospects of improvement.

Overall THREATS

Low Threat
The present cultural landscape of paddy fields and rural dwellings provides an appropriate aesthetic landscape foreground to the scenic amenity of an extraordinarily beautiful and awe-inspiring tower karst landscape featuring dramatic and precipitous fengcong and fenglin landscape elements. The growth of visitor numbers, and urbanization remains a significant threat but has been tackled through a series of measures since 2019 and considered by the WH Centre, IUCN and reported to the World Heritage Committee in 2021 and 2023, with satisfactory results reported. Thus the overall assessment of a low degree of threat is appropriate, noting the need for continued strong implementation and monitoring of the agreed regulations, management plan and visitation capacity limits that have been established.

Overall PROTECTION and MANAGEMENT

Mostly Effective
The period since the last IUCN Conservation Outlook Assessment in 2020 has seen a notable strengthening of the protection and management of Trang An, addressing some notable past shortcomings and removing some damaging past developments. There has been a particularly strong response to the recommendations of the 2019 Reactive Monitoring Mission, and the property has now progressed sufficiently to not require further reporting to the World Heritage Committee in the immediate future. While this is commendable, it will be crucial that this progress is maintained, to sustain effective protection and management and ensure the strong engagement of local communities. The establishment of a reintroduction project for the Delacour’s Langur, with successful initial results, shows that there remains the ability to manage intensive visitor use alongside the maintenance and enhancement of nature conservation values. There is exemplary engagement of international support in the site. The management of the show caves, and assuring high standards of lighting and display would warrant further consideration to ensure that all of the highest standards are being maintained, as would a review of the impacts of telecommunications masts. The recognition of this progress through an improved overall assessment of protection and management is warranted.

Full assessment

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Description of values

Extraordinarily beautiful and awe-inspiring tower karst landscape

Criterion
(vii)
The tower karst landscape of Trang An is a spectacular system of forest- mantled limestone rock towers up to 200m-high. The property incorporates a footcave enclosed depression (cockpit) landscape that is considered by experts to be the best in the world. The cockpit landscape is characterized by sharp ridges enclosing deep depressions filled by waterways that are interconnected by a myriad of subterranean cave passages, all contributing to a multi-sensory visitor experience. Blending with the forests are extensive rice paddy fields bordering streams, with local farmers and fisher folk engaged in their traditional way of life. The dramatic mountains, secretive caves and sacred places in Trang An have inspired people through countless generations (IUCN, 2014; World Heritage Committee, 2014).

An exceptional geological site showcasing the final stages of tower karst landscape evolution in a humid tropical environment

Criterion
(viii)
The property demonstrates a series of classical karst landforms, including towers, cones, enclosed depressions (cockpits), interior-draining valleys (poljes), foot caves and subterranean cave passages with speleothems. These landforms are a result of the deep dissection of an uplifted limestone massif over a period of five million years. Trang An is unusual in being an autogenic (rainfed only) karst system. The presence of transitional forms between ‘fengcong’ karst with ridges connecting towers, and ‘fenglin’ karst where towers stand isolated on alluvial plains is an extremely significant feature of the property. Former fluctuations of sea level are evidenced by a series erosion notches in cliffs, with associated caves, wave-cut platforms, beach deposits and marine shell layers. Five former coastlines at different heights above current sea level have been mapped and dated (World Heritage Committee, 2014; SUNDASIA archaeological project 2016-22).
Significant biodiversity values related to scenic amenity and karst landform development processes.
There are natural biological values that contribute to the scenery and aesthetics of the property and to the evolutionary processes that underpin the development of the property’s complex karst systems. The natural rainforest cover of the landscape ensures that natural karst processes are on-going. The property is also home to the “near threatened” native Chinese Serow (Capricornis milneedwardsi) (IUCN, 2013). Recent biological surveys and monitoring have identified >170 plant taxa and 78 species of birds. In 2020, a trial re-introduction of the critically endangered Delacour’s Langur (Trachypithecus delacouri) started and has proven successful. Three infants have been born to the initial three individuals released in 2024 (State Party of Viet Nam 2024), and four offspring are reported in July 2024 (Three Monkey Wildlife Conservancy 2024). Similar programs for other endangered primates are being considered along with the potential introduction of plants such as mangroves (SUNDASIA archaeological project 2016-22).
Interaction of early humans with then natural landscape.
Trang An is a mixed world heritage site, and it is listed as of OUV under Criterion (v): Trang An is an outstanding locale within Southeast Asia, for demonstrating the way early humans interacted with the natural landscape and adapted to major changes in climatic, geographical and environmental conditions over a period of more than 30,000 years. The long cultural history is closely associated with geological evolution of the Trang An limestone massif in late Pleistocene and early Holocene times, when the inhabitants endured some of the most turbulent climatic and environmental changes in Earth history, including repeated submergence of the landscape due to oscillating sea levels. Within the one compact landscape there are many sites covering multiple periods and functions, comprising early human settlement systems (World Heritage Committee, 2014 and subsequent Statement of OUV).
Agricultural landscapes
The site includes and is set within a landscape of paddy fields and traditional local agriculture and fishing, noted as complementary to the geodiversity values and historic heritage value.

Assessment information

Low Threat
The relatively large resident population at the time of nomination combined with the relocation of an unspecified number of people to ‘transformed’ landscapes in and around the buffer zone had raised some concern, and the ongoing growth of the population in the buffer zone and the threat of residential and commercial development to landscape values has been a continuing concern. However, the management authorities, having undertaken a comprehensive assessment of development in the buffer zone and having introduced new controls on the volume and character of residential and commercial growth, continue to maintain that there are no significant threats to development in the buffer zone now or in the foreseeable future. Other concerns stem from dredging work being undertaken to increase access to foot-caves and the potential for domestic goats to escape into the Protected Natural Zone of the Property has been noted in previous assessments. The State of Conservation Process since the 2019 mission has shown strengthened action on the regulation of development. Overall, while current threats to the property can be considered to be low, inadequately planned and managed tourism can be regarded as the most notable ongoing threat to the property. Action has been taken by the State Party, and followed up through the State of Conservation monitoring process to put in place a range of measures to strengthen management including the completion of capacity studies, and the setting of limits in all six of the different areas of property. Nevertheless, visitor numbers continue to grow. While these actions are welcomed in the most recent State of Conservation Report, and have also led to the property potentially being phased out of reactive monitoring process by the World Heritage Committee, continued monitoring of implementation will be required to ensure that tourism remains within the capacity limits, and the direct and indirect threats are managed on an ongoing basis.
Dams & Water Management/Use
(Dredging for maintenance purposes)
Low Threat
Inside site
, Localised(<5%)
Dredging work is undertaken within the Property for maintenance purposes. The State Party assures that this does not significantly impact the natural water flow regimes, water quality or water levels. Should dredging be undertaken to improve foot-cave access this would need to be the subject of a detailed Environmental Impact Assessment (IUCN, 2013; State Party of Viet Nam, 2014).
Dredging was required to open a new route to ease the problem of overcrowding in 2016 (State Party of Vietnam, 2018) without an EIA having been conducted. No recent information or change in regard to this activity has been reported in recent years. The draft management plan makes note of plans for dredging several waterways and in particular on dredging operations in caves (Ninh Binh Provincial People’s Committee, 2021). The extent and purpose of such dredging should be detailed in an EIA prior to works being carried out.
Invasive Non-Native/ Alien Species
(Introduced animal species)
Low Threat
Inside site
, Widespread(15-50%)
Outside site
Four introduced animal species have been identified in the property: one is a species of snail found in the waterways while goats, cattle and water buffalo are grazed within the property. Natural karst processes are dependent on naturally functioning ecosystems including intact biodiversity and these processes may be impacted by introduced species. Domestic goats potentially impact the near-threatened Chinese Serow (Capricornis milneedwardsii) (State Party of Viet Nam, 2013; IUCN, 2014). There is potential for the goats to escape from where they are tolerated in the Multiple Use Zone into the Protected Natural Zone from which they will difficult to eradicate (WHC/ICOMOS/IUCN, 2019). Although the threat posed by the introduced snail and the impact of grazing by goats and buffalo are acknowledged but considered insignificant in the draft management plan, it does very specifically provide for ongoing monitoring of the populations and providing reactive management to minimize impacts (Ninh Binh Provincial People’s Committee, 2021).
Residential Areas
(Settlements)
Low Threat
Inside site
, Scattered(5-15%)
At the time of its inscription some 14,000 people lived within the Property (State Party of Viet Nam, 2013). There has been a substantial increase in the population of the buffer zone, particularly near the tourist gateways to the property (IUCN Consultation, 2025). A research study on local participation in the site (Mai et al., 2022) cites 2019 figures from the site management of 20,000 people in the property and 27,000 in the buffer zone. This threat has been the subject of consideration by the World Heritage Committee and action by the State Party since 2019. The authorities have subsequently provided a revised management plan for the period 2021 to 2025 vision to 2045, which has met with UNESCO approval.
Fire & Fire Management
(Forest fire)
Low Threat
Inside site
, Localised(<5%)
Outside site
Media outlets (e.g. Viet Nam News 2025) reported on a forest fire in the site in January 2025. This is understood (IUCN Consultation, 2025) to have been rapidly contained and only impacting a small area of production forest. Nevertheless the presence of the fire shows a degree of vulnerability of the site to fire damage.
Recreational Activities
(Increasing visitation)
High Threat
Inside site
, Widespread(15-50%)
The projected 2 million annual arrivals by 2020, which raised concerns about the potential impacts this could have on the property’s OUV (IUCN, 2014), was revised to 3.5 million in 2016. The concerns noted following the 2019 Reactive Monitoring Mission (WHC/ICOMOS/IUCN 2019) have been summarized in the 2020 World Heritage Outlook Assessment. Visitation continues to be high and the potential to overwhelm the site remains the most significant threat to the site. The State Party has taken a series of actions in the last 5 years, reported to the World Heritage Committee to undertake capacity assessments in 6 different zones, to define and management tourism activities. This has been assessed as appropriate and effective (UNESCO 2021, 2023). The most recent report of the State Party (State Party of Viet Nam, 2024) reports the completion of capacity studies of the last two areas of the property, and indicates visitor numbers across the six zones between c.3,000 visitors per year in the least visited areas, to 1.6 million visitors in the intensively visited areas, and a total across all the six areas of 2.8 million (which presumably will include some double counting in the different zones). This is consistent with the progressive growth of visitation reported in the 2022 State Party report, which provided visitor numbers that show a pre-COVID peak of a total of 3.1 million, falling to 721,000 in 2021, and then growing to 1.33 million for a half year in 2022 (State Party of Viet Nam 2022). It appears therefore that numbers are resuming a level close to those pre-COVID.
Trang An was selected as one of the few Properties in the world for a UNESCO pilot project on sustainable tourism. Training, in tourism management has been given a high priority. More than 30 training courses were held from 2015 to 2020, involving more than 6,000 people, including staff and local residents at major tourist sites in the Property (IUCN Consultation, 2025).
Given the small size of the site, the scale of visitation remains a high threat to the site, and requires the continued active and effective management to ensure its impact remains within the capacity of the site as a whole.
High Threat
The entire process of nomination, inscription, reporting and assessment of the property has overlooked the significance of the 100 or more caves within the property from the perspective of the sensitive and vulnerable ecosystems they provide for a wide variety cave-adapted vertebrate and invertebrate fauna, some of which will upon investigation will likely prove to be endemic to the property. The development of show caves presents a threat due to severe lampenflora impact and to the disturbance of bats. Interpreting the caves from a geological perspective and acknowledgment of the caves habitat values is essential to assess and address threats to these important ecosystems.
Recreational Activities
(Inadequately managed Show-cave tourism)
High Threat
Inside site
, Localised(<5%)
Although the 2019 mission did not visit the sites it is known that a few caves are show-caves (with lights and pathways) for tourists. Third party observations of intense coloured lighting, indicate that these caves are vulnerable to lampenflora impact. Furthermore, numerous images and associated text found in various online travel blogs note that the thousands of bats found in the caves are regularly and deliberately disturbed by visitors to the caves (WHC/ICOMOS/IUCN, 2019). However, this is disputed by the management authority. The draft management plan acknowledges the need to modify the cave lighting systems to address the problem of lampenflora (Ninh Binh Provincial People’s Committee, 2021) but fails to address the impacts of lighting and visitor use of caves on the cave ecosystems. The entire process of nomination, inscription, reporting and assessment of the property has overlooked the significance of the 100 or more caves within the property from the perspective of the sensitive and vulnerable ecosystems they provide for a wide variety cave-adapted vertebrate and invertebrate fauna, some of which will upon investigation will likely prove to be endemic to the property.
Biological System Management
(Modification of cave habitats)
Data Deficient
Inside site
, Extent of threat not known
Page 52 of the draft management plan includes a project to embellish ecological caves, valleys and islands but does not detail just what the term embellish means. Appendix 3 of the plan acknowledges exploring the caves to be part of the property's tourism product (Ninh Binh Provincial People’s Committee, 2021), but other than presenting the legends and histories associated with the various caves there is no discussion on interpreting the caves from a geological perspective or acknowledgment of the caves habitat values.
Involvement of stakeholders and rightsholders, including indigenous peoples and local communities, in decision-making processes
Mostly Effective
While there were commendable efforts to consult with local people during the nomination process with a view to securing broad based support for the site to become World Heritage, the 2019 reactive monitoring mission noted local resentment towards the World Heritage listing and the need for ongoing and transparent consultation with relevant national authorities and community stakeholders (WHC/ICOMOS/IUCN, 2019). Since then, there have been continued efforts to engage and support the community and it appears that the situation has improved, with the World Heritage Committee in 2023 (UNESCO 2023) commending the State Party’s efforts in engaging cooperation with public and private partners to increase livelihood and resilience of the local populations, in particular its focus on the position of women. A 2022 study (Mai et al., 2022) broadly confirms the positive improvement of the situation, concluding that there is strong engagement of communities and noting that: communities only cooperated to protect the environment out of fear of financial repercussion in the beginning. After witnessing the positive transformation of the area, both in terms of economic and environmental means, they are beginning to develop a pride and start to act towards the sustainable development of the local tourism. Based on the same sources, there is a continued need of the governmental authorities to take further steps to include community participation in their work, and this appears an important aspect for further strengthening in the property’s management.
Legal framework
Mostly Effective
The property is largely secured within three statutory protected areas owned by the Socialist Republic of Viet Nam and controlled by the Ninh Binh Provincial People’s Committee. It has been accorded the highest legal status for protection available in Viet Nam. Management of the property is delegated to a Management Board, which has extensive decision-making powers, responsibilities and resources. In 2017 the Board became embedded within the Provincial Department of Tourism but maintains its independence and its close functional links with research institutes and commercial and community stakeholders. It is guided by a Government-approved and legally binding management plan which is modelled on the highest international standards to address all important factors affecting the property (World Heritage Committee, 2014; WHC/ICOMOS/IUCN, 2019). In the evaluation report, IUCN raised concern in regard to the delegation of management responsibility in the context of tourism development through the granting of a 70 year private sector lease over the 3,000 hectare Trang An – Tam Coc – Bich Dong Scenic Landscape with details set out in the 2020 IUCN Outlook Assessment. The 2019 reactive monitoring mission noted that lease holders are allowed to operate and construct any facilities which are permitted in their license (or approved project), with details also summarized in the 2020 IUCN Outlook Assessment. The mission also learned (but did not directly observe the management practices being applied) of commercial show-cave and bird-watching activities at some of these sites and noted the need to establish a systematic monitoring programme to detect changes to the environment including the proliferation of lampenflora in the Show-caves and the impact of tourism on wildlife, such as bat and bird populations exposed to human activities (WHC/ICOMOS/IUCN, 2019). The property has taken action, followed up through the Reactive Monitoring process (UNESCO 2021, 2023) to strengthen the legal instruments providing protection to the property and the results have been noted positively in the relevant Committee decisions and State of Conservation Reports. Whilst there is a need for continued implementation it can be concluded that the regulatory system has been improved since 2020.
Governance arrangements
Mostly Effective
The property benefits from an established Trang An Management Board, which has been the focus of capacity development since 2020. The 2022 State Party Report indicates a highly-qualified and multi-disciplinary membership of the Board (State Party of Viet Nam, 2022). An ad-hoc Management and Scientific Advisory Committee was established, and welcomed by the World Heritage Committee in 2021.
In October 2024, the Ninh Binh Department of Tourism restructured the Advisory Committee to include leaders of the Department of Tourism, TAMB, National Cultural Heritage Council, domestic and international experts and scientists in the fields of archaeology, geology, biodiversity, management, and conservation and promotion of heritage values. The tasks of the Advisory Commission include consultative roles on (a) the management, conservation and sustainable use of the heritage values of Trang An Landscape Complex to ensure that the property's OUVs are maintained effectively and the standards of a World Heritage Site are upheld; (b) implementation of socio-economic development projects, scientific research projects; tourism development in the property and application of science and technology, research results, new discoveries in archaeology, history, geology, biodiversity etc., within the property; and (c) promoting cooperation, relationships and connectivity between domestic and international organizations, experts, scientists, state agencies, research institutes, businesses and local communities (State Party of Viet Nam 2024), which appears to be a strengthened level of technical oversight for the property.
The governance arrangements include an effective collaboration of the different public and private interests in the property, and appear to be broadly effective. The institutional arrangements for ensuring the inclusion of voices from the local communities are less clear, and it would be appropriate to better understand this aspect of the governance of the property, and to strengthen this where possible.
Integration into local, regional and national planning systems (including sea/landscape connectivity)
Some Concern
Most of the property is secured within three statutory national protected areas and regulations concerning management, protection and promotion of heritage values have been developed at both central and provincial government level (State Party of Vietnam, 2013, 2014). Provincial aspirations clearly support tourism development and its potential benefits so it is essential that management of the property be planned in an integrated way with regional and indeed national tourism development planning. However, the 2015 revised management plan, which includes a section referred to as the ‘tourism management plan’ did not adequately address management of the potential for the projected increase in tourism to impact on the OUV of the property (World Heritage Committee, 2016). The placement of the Management Board within the provincial Tourism Department in 2017 is considered to strengthen the Boards position in dealing with the pressures to further the property’s role in the economic development of the province. While this could also be seen to confirm that tourism is the primary management objective for the property the 2019 RMM report notes that ensuring a balance between tourism development and protection of the property is a key aspect of the new management plan now in preparation (WHC/ICOMOS/IUCN, 2019). There has been an improvement in the recognition of the protection of the property through the measures taken since the mission, and reported to the World Heritage Committee (UNESCO 2021, 2023).
Boundaries
Highly Effective
All of the key elements of a fengcong and fenglin Karst landscape are present within the inscribed property and the natural processes of Karst development are on-going. However, whilst the property was of sufficient size to include all of the values that underpin World Heritage criteria (vii) and (viii), the boundary as selected was not the most appropriate in relation to natural criteria, as it included developed areas and infrastructure which detracted from the OUV (IUCN Evaluation, 2014). In its December 2015 response to the World Heritage Centre the State Party proposed minor boundary changes to resolve this concern and the proposed changes were approved by the Committee in Decision 40 COM 8B.36 (World Heritage Committee, 2016). It is acknowledged that the boundaries of the property were selected not only to include all the important OUV attributes but also to provide for effective management of the property overall.
Overlapping international designations
Data Deficient
N/A
Implementation of World Heritage Committee decisions and recommendations
Highly Effective
In 2014 the State Party was asked to make a minor alteration to the boundary of the property and to submit a revised management plan to address the committees concerns about effective management of tourism and to include in it effective measures to prevent overcrowding within the property. In 2016 the Committee noted the change made to the boundary but again expressed its concern about the revised plans provisions for tourism management. The State Party provided State of Conservation reports for 2017 and again for 2019 providing extensive detail of the steps it has taken to address the further concerns of the Committee expressed in Decision 40 COM 7B.67. The 2019 RMM provides numerous recommendations for consideration by the Board in the preparation of the 2021-2026 Management Plan (State Party of Viet Nam, 2018, 2020; WHC/ICOMOS/IUCN, 2019). Following the mission the property has continued to be included in the State of Conservation process, with reports to the World Heritage Committee in 2021 and 2023 (UNESCO 2021, 23). In these decisions substantial action is noted and welcomed in addressing the RMM recommendations, and the ongoing threats to the property. Based on the progress achieved the State Party was asked to provide a report in 2024, but without the need for a further WHC/IUCN report to the World Heritage Committee. This report confirms the substantial completion of the remaining work requested. In this regard it can be concluded that there has been an effective response to the World Heritage Committee’s decisions, noting that there will continue to be a review of the latest report in view of the recent history of concerns and issues.
Climate action
Data Deficient
No specific information available.
Management plan and overall management system
Highly Effective
The Property is State-owned and controlled by the Ninh Binh Provincial People’s Committee. It is managed by the Trang An Landscape Complex Management Board. In 2017, the Board became embedded within the Provincial Tourism Department. Management is guided by a legally binding management plan which adopts a zoning system that allows for management prescriptions to be more effectively aligned to the varying protection and use requirements in different parts of the Property. Ongoing management priorities include: extended monitoring and control of tourist operations; development of visitor centres and services; ongoing research together with improved archaeological site conservation. Long-term concessionaire leases delegate authority for some aspects of conservation and tourism management to four private tourist operations within the property. From the time of its inscription onto the World Heritage list in 2014 the World Heritage Committee has expressed concern about some aspects of the Management Plan. The Plan presented as part of the nomination documents was revised in 2015 and in 2016 the State Party was asked to amend some aspects of the revised Plan, particularly in regard to management of overcrowding by the projected increase in visitor numbers (1 million to 2 million by 2020) (World Heritage Committee, 2016). The further revision was presented in the form of an Archaeological Heritage Management Plan and a separate Visitor Management Action Plan which revises the projected 2020 visitation from 2 million visitors to 3.5 million. The 2019 RMM report acknowledges the latter to be an important management tool, but notes that it fails to address the requests by the WH Committee. The report further notes that a new plan for the period 2021-2026 is being prepared (WHC/ICOMOS/IUCN, 2019), which has subsequently been completed and provided to the World Heritage Committee. Thus the property benefits now from both an updated management plan and improved management system to support its implementation (UNESCO 2021, 2023).
Law enforcement
Mostly Effective
The property is well protected within a national and provincial legislative framework based on four primary national legal statutes applying to protection and use of the property. They include extensive measures for identification, recognition, protection, preservation, management, research, monitoring, reporting, and promotion of the cultural and natural values and attributes of the property. Importantly they include enforcement measures for specifying violations and illegal activities and for the discipline and prosecution of offenses. In general, enforcement is not a significant issue for management of the property although staff are positioned at strategic points in order to rapidly respond to potential incidents of inappropriate behavior by tourists and in the event of illegal acts (e.g. the walkway construction) by commercial interests in the property, the Board has taken the appropriate action (WHC/ICOMOS/IUCN, 2019). Regular law enforcement patrols are undertaken to detect any infringements against regulations in a timely manner (State Party of Viet Nam, 2020).
Sustainable finance
Highly Effective
Trang An has an adequate level of finance supported by the significant income from visitors. The 2013 IUCN evaluation report cites that the average annual funding for development and management of the property is an adequate USD500,000, with capital investment funding in the order of some US$7 million in recent years. In 2020 the Management Board was reported to have an annual budget in excess of $US 5 million for maximizing the use of the property and the protection of its OUV (State Party of Viet Nam, 2020). This is rated as a large and steadily growing budget with its effectiveness being re-evaluated in parallel with the 2021-2026 management plan, with the reports to the World Heritage Committee indicating increased resources (but with no figures quoted). There do not seem to be immediate challenges regarding the sustainable financing of the property.
Staff capacity, training and development
Mostly Effective
The Management Board has primary responsibility for all aspects of day-to-day management of the property; in 2015 it had a staff of 84. Incomplete data in available reports indicate that in 2019 the Board had a staff comprising an executive of 3, administration support of 8, a technical and researcher division of 7, a foreign affairs and public relations division of 7, an environment and landscape management division of 13, 140 rangers and security staff and 95 guides (State Party of Viet Nam, 2020; WHC/ICOMOS/IUCN, 2019). The 2020 IUCN Outlook Assessment provides details on the findings of the 2019 mission regarding this issue. Following the mission there has been an investment in staff training, and the 2022 State Party report (State Party of Viet Nam 2022) notes the period from 2019 to 2022 saw eight employees have enrolled for postgraduate degrees in business management, culture and heritage and 25 in a range of other courses. Working with the Management Board, SUNDASIA has funded training for 140 local staff in natural and cultural heritage management, and undertaken a detailed survey to assess the role of ecotourism and local community management towards sustainable development (SUNDASIA archaeological project 2016-22). Training, in tourism management has been given a high priority. More than 30 training courses in cultural and natural heritage management were held from 2015 to 2020, involving more than 6,000 people, including staff and local residents at major tourist sites in the Property (SUNDASIA Archaeological project 2016-22).
It is thus assessed that staffing is mostly effective, and undergoing continued strengthening.
Education and interpretation programmes
Mostly Effective
The revised management plan acknowledges the important role of interpretation, raising awareness of and respect for the property’s OUV and notes the Board’s intent to develop and implement a comprehensive interpretation plan to help orient visitors to the property, influence their behaviour and enhance their experience (State Party of Viet Nam, 2015). As noted in the 2020 IUCN Outlook Assessment, and following the 2019 mission (WHC/ICOMOS/IUCN 2019) there have been challenges in implementation, including what have been seen as inappropriate developments including an illegal walkway and a poorly located developed based on a former film set. Following the mission both of these features have been removed and the issues were regarded by the World Heritage Committee as resolved in 2022. The State Party has taken a range of interventions related to interpretation and visitor management, with the support of UNESCO and a number of national and international partners, and a programme of training for guides and other local providers.

The revised management plan includes provision for promoting the Property as an important site for education and to encourage educational institutions to use it for studies, and to develop and implement a comprehensive interpretation plan for the Property. Within the SUNDASIA archaeological project, funding and content was provided for a poster and documentary exhibition that accompanied the release of the Delacour’s langur into Trang An, while evidence from Trang An’s archaeological research has been prepared for an exhibition. As of October 2023, this includes four large touch-screen terminals with bilingual interactive story-maps tracing different aspects of the property’s past and its future; a series of 14 commissioned 1/5 scale figurines depicting aspects of prehistoric life; a 212pg illustrated popular book; and a forensic facial reconstruction of the face of the 12,000-year-old individual that was uncovered. The row boat operators are trained as guides, so virtually all visitors receive guidance on the property’s natural and cultural values. The replica film set is no longer operational. When resources allow, the Tourism Center at Trang An Scenic Landscape Area will be supplemented with translation and educational equipment, a display area and a mini-museum. There are plans to invest in and upgrade small tourist centres at the other gateways to the Property (IUCN Consultation, 2025).
Tourism and visitation management
Some Concern
Visitor management is the most significant issue for the property. Visitation is focused on 6 areas; the Hoa Lu Ancient Capital site managed by the Department of Culture and Sport and 5 which are managed by licensed concessionaires. Access to Hoa Lu is limited to foot traffic only whereas the 5 privately managed sites are dependent upon small rowboats (access to Bird Valley is by car, cycle or foot with an optional boating activity). This site also includes a substantial resort development and it (and reportedly one other area) has show-caves which are accessed by both boat and foot traffic. The Property has two very distinct types of visitors; those who come to enjoy the spectacular scenery and observe the local culture and those, the vast majority of visitors, who visit the site as religious pilgrims. These two groups are not particularly distinct, as many religious pilgrims (who are mainly drawn to Bai Binh Pagoda in the buffer zone of the Property) also visit the Property for sight-seeing and cultural appreciation. A challenge for management is meeting the different needs and expectations of each group. In fact, management of the substantial number of pilgrims who visit Bai Dinh pagoda is largely a matter outside the responsibility of the Trang An Management Board and becomes only of concern where and when the pilgrims visit the Property. The 2019 Reactive Monitoring Mission (WHC/ICOMOS/IUCN 2019) paid detailed attention to these issues, and the position is summarized in detail in the 2020 IUCN Outlook Assessment.

Since the mission the property, as with all sites worldwide, was greatly impacted due to the suppression of tourism through the COVID pandemic, but numbers appear to now being re-established at levels that will likely reach the pre-COVID levels of visitation (State Party of Viet Nam 2022). There has been major and continuing work since the mission to undertake capacity studies for the six tourism areas for the property, and these have been completed in 2024, and reported in sequence previously to the World Heritage Committee (State Party of Viet Nam 2020, 2022, 2024). The State Party continues to assess that visitor numbers remain within the limits that have been established, and it appears there is now a sufficiently rigorous framework to enable a more sustainable planned approach to visitor management. Visitor carrying capacity surveys have been conducted for all major tourist nodes in the Property and measures to avoid overcrowding impacts are in place. Tourist operations conducted at present levels and intensities are shown to be within social carrying capacity limits and have no detrimental impact on the natural OUV of the Property. The revised management plan 2021-2025 vision to 2045 addresses the potential for impacts from increased levels of tourism, and the plan also maintains a balance between tourism development and protection. Previous inappropriate developments have been remedied satisfactorily and followed up with improved and more effective collaboration with private and commercial stakeholders.

Nevertheless, the numbers visiting the property remain high, and the priority for monitoring and willingness to restrain visitor growth will be crucial to ensure the site is not overwhelmed. The visitor numbers noted also make clear that there remain areas with low levels of visitation, and it will be important to maintain a variety of options to provide for those who visitors who wish to avoid areas with very high levels of visitation.
Sustainable use
Mostly Effective
The 2020 IUCN Outlook Report provides an extensive summary of the position regarding sustainable use, which is linked with the question of sustainable tourism as by far the dominant form of use of the property. As is noted under the discussion on tourism and visitation, the position remains challenging but has improved over the last five years through the conclusion of reviews of carrying capacity, and increasing the effectiveness of the implementation of management. Rapid growth of tourism in the Property leading to changes in livelihoods, cultural values, customs, practices and lifestyles of local people is the subject of a recent research project, which focused on three populous local communes. The results show that changes induced by tourism development are largely positive, contributing to the structural transformation of the economy from agriculture to services, handicrafts and improvements in material and spiritual life, while traditional cultural values are preserved and promoted; new knowledge, science and technology, experience, professional skills, innovative business methods are absorbed and supplemented by the people to enrich the social and cultural life of the local community (Bui Van Manh, 2018. “Changing culture and livelihoods of residents in the Trang An Cultural Landscape under the impact of tourism", unpublished Ph.D. Thesis).

It is also apparent that there has been a significant emphasis on the engagement of communities in the question of sustainable use and the sharing of benefits, and this is noted in both the State Party reports and recent research in the property.
Monitoring
Mostly Effective
The 2019 RMM report noted that aside from recording the numbers of visitors monitoring is generally limited to recording anecdotal comments about casual observations and that a program of research activities called the SUNDASIA project has been initiated and includes elements of wildlife monitoring. The report makes several recommendations in regard to increasing monitoring activities (WHC/ICOMOS/IUCN, 2019). Since the mission it is clear that the monitoring arrangements have strengthened in relation to attributes, as well as the establishment of the capacity studies. State Party reports (State Party of Viet Nam 2022, 2024 provide quantitative data on key parameters such as visitor numbers, and monitoring results of wildlife values are also reported. It appears there is room to establish now a fully effective and reportable monitoring system across the main values, attributes and threats to the property.
Research
Highly Effective
The 2019 RMM report commends the State Party for engaging in international cooperation and collaboration with national experts in the field of archaeological research, observing international standards of non-destructive techniques and in situ conservation and notes the establishment of a Management and Scientific Advisory Committee (WHC/ICOMOS/IUCN, 2019). It is apparent that a continued strong focus on international research is continuing, as can also be seen from the projects listed in the present assessment and as noted in the most recent State Party report (State Party of Viet Nam 2024). There is scope to share the lessons learned from this work more fully in the World Heritage system as a case study example for other sites to follow. An innovative, productive and collaborative research program, involving the Ninh Binh Provincial authorities, national and international (predominantly British) partners, remains active in the post-inscription period. This program which covers archaeology, history, biodiversity, geomorphology, cultural heritage and tourism is proving key information and proving highly effective for improved management of the Property (IUCN Consultation, 2025).
Effectiveness of management system and governance in addressing threats outside the site
Mostly Effective
The management system appears to be functioning effectively and has the engagement of the national and provincial authorities in its implementation. The responsiveness to the Committee’s decisions and the 2019 Reactive Monitoring Mission (WHC/ICOMOS/IUCN 2019 is commendable). The site is relatively small in size and the pressures on the wider area are evident, and thus continued vigilance and prompt action on issues identified will remain essential.
Effectiveness of management system and governance in addressing threats inside the site
Mostly Effective
The 2019 RMM and 2020 IUCN Outlook Assessment noted significant concerns regarding the effectiveness of protection and management, and with evidence of inappropriate tourism developments which have been removed at the request of the World Heritage Committee. The 2020 assessment notes correctly that they emphasize the Advisory Bodies’ concerns that “the greatest threat to the nominated property is from inadequately planned and managed tourism”. It is apparent that since the monitoring mission, and as noted in the relevant State of Conservation reports that there has been a significant period of progress to strengthen the governance, technical expertise, management planning, tourism capacity assessment and monitoring. This has led to a highly positive assessment of the World Heritage Committee, and the phasing out of reporting to the Committee for the time being.
The period since the last IUCN Conservation Outlook Assessment in 2020 has seen a notable strengthening of the protection and management of Trang An, addressing some notable past shortcomings and removing some damaging past developments. There has been a particularly strong response to the recommendations of the 2019 Reactive Monitoring Mission, and the property has now progressed sufficiently to not require further reporting to the World Heritage Committee in the immediate future. While this is commendable, it will be crucial that this progress is maintained, to sustain effective protection and management and ensure the strong engagement of local communities. The establishment of a reintroduction project for the Delacour’s Langur, with successful initial results, shows that there remains the ability to manage intensive visitor use alongside the maintenance and enhancement of nature conservation values. There is exemplary engagement of international support in the site. The management of the show caves, and assuring high standards of lighting and display would warrant further consideration to ensure that all of the highest standards are being maintained, as would a review of the impacts of telecommunications masts. The recognition of this progress through an improved overall assessment of protection and management is warranted.
Good practice examples
As also noted in the 2020 IUCN Outlook Assessment, the State Party's response to the requests made by the Committee at the time of the site's inscription was rapid and effective, in particular in addressing concerns raised about the boundary design of the site. This responsiveness has continued following the 2019 Reactive Monitoring Mission by UNESCO, ICOMOS and IUCN, and has led to a continued strengthening of the conservation status and effectiveness of the property.

Extraordinarily beautiful and awe-inspiring tower karst landscape

High Concern
Trend
Improving
The Trang An Landscape Complex contains a relatively undisturbed “core area” of superlative natural phenomena and of exceptional natural beauty and aesthetic importance which is quite confined in its total area (IUCN, 2013). The site’s natural values remain intact, but concerns noted in previous Outlook Assessments about the potential adverse impact of the visitor use of the area are inevitable given the small size of the site and the still recent improvement in protection and management effectiveness. It is welcome that there has been decisive action to remove inappropriate developments in response to concerns from the World Heritage Committee, and to resist and reverse a “theme park” style of management. A review of the masts noted as concerning by the Reactive Monitoring mission (WHC/ICOMOS/IUCN, 2019), as well as considering the management of show caves appears to still require attention. It appears deterioration of the visual condition of the site has stabilized. With a demonstrable and sustained implementation of actions to manage the impacts of visitor pressure, it could be hoped to progress to Low Concern on this aspect of the values by the time of the next Outlook report.

An exceptional geological site showcasing the final stages of tower karst landscape evolution in a humid tropical environment

Low Concern
Trend
Data Deficient
The property displays a natural area of fengcong dominated karst in the inner part and protects an overall diverse karst landscape. The karst values of Trang An are substantially intact, however. They are threatened by areas of development and human activity and by the potential impact from growing tourism (IUCN, 2014). Potential dredging impacts and potential alteration to the footcaves, including the adverse provision of utilities (cave lighting) are of concern as there is a trend towards opening new routes, likely through more caves, which would risk an increase the dredging activity. It appears that the increased threats noted in the 2019 RMM have been responded to (WHC/ICOMOS/IUCN, 2019) but information remains lacking on aspects of the management of show caves. It will be important to restrict the development of further routes and visitor levels to remain within the established limits that are now in place.
Assessment of the current state and trend of World Heritage values
Stable
The values of the property appear likely to be sustained in the future. A series of concerns have been noted previously regarding the state of conservation of the property since inscription, which have resulted in actions being taken, initially including a minor boundary modification in 2016. A large range of concerns were identified in the 2019 Reactive Monitoring Mission and actions taken since the mission have restored the loss of attributes of the nature conservation value that were reported by the mission and led to a greatly strengthened management framework and capacity. It can be assessed that there is a low concern on the outlook for the nature conservation values of the property, and that the situation now appears to be stable, and with further prospects of improvement.
Assessment of the current state and trend of other important biodiversity values
High Concern
Improving
The forest cover and associated fauna are an integral part of the natural Karst landform development process at Trang An and the management of these values, their condition and change in condition and threats such as the presence of semi-wild domestic goats were acknowledged and monitoring of their numbers and any impacts on the property's OUV is provided for in the revised plan (State Party of Viet Nam, 2015). Inadequate consideration of cave biodiversity in terms of an inventory of what exists within the caves has been noted, but no additional information on this has been sourced (WHC/ICOMOS/IUCN, 2019; IUCN Consultation, 2019). A major step in terms of the biodiversity values of the property is the reintroduction of Delacour’s Langur (Three Monkeys Wildlife Conservancy 2024, State Party of Viet Nam 2024) which has shown initial success, and can justify an increasing trend for the values, but noting that some aspects, such as cave biodiversity, remain data deficient.
Assessment of the current state and trend of other important values
High Concern
Stable
IUCN is not in a position to make the definitive assessment of the state and trend of the other important values, as these include the values and attributes that are of OUV under the cultural heritage criteria. It is noted that the overall picture regarding the site in relation to cultural values parallels that for natural values, with the significant improvement since the 2019 Reactive Monitoring Mission and the documentation of progress by the World Heritage Committee, and the phasing out of reporting to the Committee from 2025. It is the impression of the assessor that the cultural heritage values are more immediately vulnerable to the impacts of high levels of visitation, and the risks (demonstrated by recent reversed developments) from theme park style development and inauthentic interpretation and visitor facilities.

Additional information

Outdoor recreation and tourism
Tourism contributes substantially to the local economy and the dramatic increase in tourism is seen as a very positive step by the management authority and the provincial government. The number of local people earning a living by rowing boats and working as guides in the property has increased substantially in recent years. Of even greater significance is the increase in the food, beverage and merchandise outlets at the gateways into the property and elsewhere in the buffer zone associated with the enormous expansion of tourist accommodation facilities. A notable impact of the growth of tourism related income is the reduced dependence on subsistence farming. During the mission it was noted that rice farming was less intensive than it was just 5 years ago with most farmers growing just 1 crop instead of 2 crops each year.
Facilities to support tourism (restaurants/cafes/accommodation) have expanded dramatically and have significantly changed the character of the buffer zone, particularly at the Trang An, Tam Coc and Hoa Lu gateways. The Management Board has taken significant effort to successfully control the style and extent of development such that a traditional Vietnamese ambience has been maintained.
History and tradition
There has been a remarkably long and continuous cultural history at the site for around 30,000 years and traditional festivals and cultural events are commonplace. (State Party of Viet Nam, 2013; IUCN, 2014)
Fishing areas and conservation of fish stocks,
Traditional agriculture,
Livestock grazing areas
Traditional landholders undertake agriculture that includes growing rice, raising livestock (ducks) and fishing. (IUCN, 2013) Goats, water buffalo and some cattle are allowed to graze in the Multiple Use zone. Agricultural activities are reducing as more of the traditional landholders become engaged in the tourism industry and there are anecdotal reports of fish stocks increasing. (ICOMOS/IUCN, 2019)
Factors negatively affecting provision of this benefit
Invasive species
Impact level - Low
The reduced agricultural activity may detract slightly from the previously known visual impact of the rice fields and the people working them as part of the experience of the Tam Coc boat route although this wont be a real issue unless the rice fields were abandoned completely. If this were to eventuate some sort of management intervention may be required to maintain the living culture appeal of the Trang An experience.
Goats pose a risk to biodiversity values if they were to escape from the Multiple Use Zone to the Protected Natural Zone.
Benefits are derived for an estimated 20,000 residents living within property and another 27,000 people in the buffer zone, which encircles the property. Trang An is claimed by the State Party to be a unique example in South east Asia of human-environment interaction where local people live and work following traditional subsistence practices, and have been present for 30,000 years. These derive primarily from the income and employment derived from tourism visitation of the site, and as a result of the protection of values that have been lost from the more intensively used landscapes surrounding the property. Agriculture and fishing activities are pursued in the buffer zone, and provide a further basis for local livelihoods.
Organization Brief description of Active Projects Website
1 TAMB, Cuc Phuong National Park, Four Paws Viet Wildlife Conservation, Ninh Binh Department of Tourism, QUB, Vietnam Academy of Social Sciences; Xuan Truong Construction Enterprise. Progress reported at 2024: the animals have integrated well on Ngoc Island, the release site in the Trang An Ecotourism Area, and exhibit normal behaviors, including foraging. The recorded data show relaxed and close behavior among the langurs. Notably, three infants have been born to the initial three individuals released. (State Party of Viet Nam 2024)
https://www.three-monkeys.org/visiting-the-reintroduced-delacours-langur-at-pearl-island-in-trang-an-scenic-landscape-complex/#:~:text=The%20Future%20of%20Delacour's%20Langurs,future%20ahead%20for%20these%20primates.
2 The UNESCO Office in Viet Nam, Vietnam National University – School of Interdisciplinary Sciences and Arts (VNU-SIS), Fondazione Santagata. Assessment of the economic value of the Trang An Landscape Complex, and elaborate policy and management measures for the sustainable development of the Site
https://www.fondazionesantagata.it/en/thematic-areas/heritage-posts/economic-impact-of-the-unesco-world-heritage-of-trang-an-site-in-vietnam/

References

References
1
IUCN (2013) Evaluation Mission Trang An Landscape Complex IUCN Gland, Switzerland
2
IUCN (2014) Evaluation Report. Trang An Landscape Complex IUCN Gland, Switzerland
3
IUCN Consultation (2020). IUCN Confidential Consultation - Trang An Landscape Complex, Viet Nam.
4
IUCN Consultation (2025). IUCN Confidential Consultation - Trang An Landscape Complex, Viet Nam.
5
Mai, N.T.T., Mai, T.P., & Trang, N.T.T. (2022). Community Participation and Sustainable Tourism: A Government-Guided Participation to Heritage Tourism in Trang An – Vietnam. Journal of Management and Development Studies Volume 11 Issue2, 61-73.
6
Ninh Binh Provincial People’s Committee (2021) Draft Management Plan for the Trang An Landscape Complex 2021-2025. Ninh Binh. Unpublished.
7
State Party of Viet Nam (2013) Trang An Landscape Complex Nomination Submitted to 38 COM
8
State Party of Viet Nam (2014) Trang An Landscape Complex Nomination Supplementary Report Submitted to 38 COM
9
State Party of Viet Nam (2015) The Management Plan for Trang An Landscape Complex, Ninh Bình Province, Viet Nam
10
State Party of Viet Nam. (2018). Report of the State Party to the World Heritage Committee on the state of conservation of the Trang An Landscape Complex
11
State Party of Viet Nam. (2020). Report of the State Party to the World Heritage Committee on the state of conservation of the Trang An Landscape Complex
12
State Party of Viet Nam. (2022). Report of the State Party to the World Heritage Committee on the state of conservation of the Trang An Landscape Complex. Available at: https://whc.unesco.org/en/list/1438/documents/
13
State Party of Viet Nam. (2024). Report of the State Party to the World Heritage Committee on the state of conservation of the Trang An Landscape Complex. Available at: https://whc.unesco.org/en/list/1438/documents/
14
Three Monkeys Wildlife Conservancy (2024) Visiting the Reintroduced Delacour’s Langur at Pearl Island in Trang An Scenic Landscape Complex. Published online 22 July 2024. Available at: https://www.three-monkeys.org/visiting-the-reintroduced-del…. Retrieved online.
15
UNESCO. (2018). Report on the State of Conservation of Trang An Landscape Complex, Viet Nam. State of Conservation Information System of the World Heritage Centre
16
UNESCO. (2021). Report on the State of Conservation of Trang An Landscape Complex, Viet Nam. State of Conservation Information System of the World Heritage Centre. Available at: https://whc.unesco.org/en/list/1438/documents/
17
UNESCO. (2023). Report on the State of Conservation of Trang An Landscape Complex, Viet Nam. State of Conservation Information System of the World Heritage Centre. Available at: https://whc.unesco.org/en/list/1438/documents/
18
Viet Nam News (2025) Forest fire breaks out at Ninh Bình's Tràng An scenic area. Viet Nam News. Published online 24 January 2025. Available at: https://vietnamnews.vn/society/1691249/forest-fire-breaks-o….
19
WHC/ICOMOS/IUCN (2019). Report on the joint World Heritage Centre/ICOMOS/IUCN Reactive Monitoring Mission to the UNESCO World Heritage property “Trang An Landscape Complex” in Viet Nam
20
World Heritage Committee (2016). Decision 40 COM 7B.67 Istanbul, Turkey
21
World Heritage Committee (2016). Decision 40 COM 8B.36 Istanbul, Turkey
22
World Heritage Committee (2014). Decision 38 COM 8B.14 Doha, Qatar
23
World Heritage Committee (2018). 42COM 7B.62 - Trang An Landscape Complex (Viet Nam) (C/N 1438bis). Manama, Bahrain. Available at: https://whc.unesco.org/en/list/1438/documents/
24
World Heritage Committee (2021). 44COM 7B.76 - Trang An Landscape Complex (Viet Nam) (C/N 1438bis). Fuzhou, China/Online. Available at: https://whc.unesco.org/en/list/1438/documents/
25
World Heritage Committee (2023). 45COM 7B.103 - Trang An Landscape Complex (Viet Nam) (C/N 1438bis). Riyadh, Kingdom of Saudi Arabia. Available at: https://whc.unesco.org/en/list/1438/documents/

Indigenous Heritage values

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