Chan Chan Archaeological Zone

Significance

Chan Chan was the capital of the Chimu Kingdom, which UNESCO says flourished in the 15th century before the Inca conquest, and UNESCO describes it as the largest earthen architecture city in pre-Columbian America, with nine rectangular palace complexes within high earthen walls. It is inscribed under criteria (i) and (iii) and covers 1,414.57 hectares. Archaeology magazine (2023) places its construction around A.D. 1000 and the Inca conquest of the Chimu around 1450, and reports 2022 excavations suggesting the city was more diverse than previously believed.

Current Status Rationale

Historical damage is documented in the site's record, but the current classification is based on present conditions and the most recent credible evidence. Chan Chan, UNESCO says, is the largest earthen architecture city in pre-Columbian America, and earth is exceptionally exposed to rain and rising groundwater. The present picture is a site that UNESCO has kept on the Danger List continuously since 1986 and whose corrective measures, set out in 2012 (decision 36 COM 7A.34), are still not fully complete: in 2021, 2023 and 2024 the Committee recorded that delimitation and regulation of the buffer zone and implementation of the amended Law 28261 on illegal occupation had remained pending for several years, in 2025 it regretted 'severe delays', and in 2026 it noted progress (buffer-zone regularisation actions, a draft regulation of Law 28261 under consultation, land tenure overlaps being identified) while encouraging Peru to finalise these processes and asking for information on the Cultural Heritage Impact Assessment of the Second Carriageway road project. Encroachment is ongoing in practice: Gestion reportedly quotes the regional culture director on about 600 square metres of the intangible zone destroyed in early 2025 and a shortage of guards. Against that, the evidence shows real, funded management: a Master Plan 2021-2031 in implementation, emergency conservation at Nik An, Huaca Toledo, La Esmeralda, Arco Iris and Takaynamo noted by the Committee in 2026, an inter-institutional working group preparing a Disaster Risk Prevention and Reduction Plan, and a UNESCO mission in 2017 that reported minimal damage from the Coastal El Niño after earlier preventive works. UNESCO has not described the 2023 rain damage as lasting loss, and no severe current damage was found. Peru has also publicly prepared for the 2026-27 season (the Ministry announced S/ 4 million for preventive measures and identified 536 critical heritage points, with Chan Chan among the highest-risk sites), against an official ENFEN coastal El Niño alert. These are forecasts and preparations rather than documented damage. Confidence is Supported rather than Confirmed because the Danger List status and the Committee's findings are firmly documented by UNESCO, but several UNESCO state-of-conservation reports and the ENFEN original communiques could not be read directly, the 2025 encroachment figure rests on one newspaper quoting one official, and the El Niño outcome for this rainy season is genuinely open. Confidence does not alter the status.

Serious, currently active threats are documented, or major historical damage remains substantially unrepaired. Credible sources support this status, with some limits on corroboration.

Threat Categories

Historical Timeline

1. 1986
   Inscribed on the World Heritage List and placed on the Danger List

   UNESCO records the property as inscribed in 1986 under criteria (i) and (iii) and as on the List of World Heritage in Danger from 1986. UNESCO's 2018 state-of-conservation page lists the fragile state of earthen structures and decorated surfaces under extreme climatic conditions (El Niño) among the threats for which it was listed. UNESCO's list has shown it as continuously on the Danger List since.

   Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre, UNESCO World Heritage Centre

2. 2000-01
   Management plan approved

   The Getty Conservation Institute's Project Terra page states that a management plan for Chan Chan was completed in 1999 and approved by government officials in January 2000, developed by the Instituto Nacional de Cultura-La Libertad with UNESCO and Terra support.

   Sources: Getty Conservation Institute

3. 2012
   Committee adopts desired state of conservation and corrective measures (36 COM 7A.34)

   The Committee set four conditions for removal from the Danger List (an operational and sustainable management system with secured funding, an updated Management Plan integrated with municipal planning, continued conservation of earthen architecture, and legislative measures against illegal occupation) and a one-, two- and three-year timetable of corrective measures, and retained the property on the Danger List. Later decisions (2021-2026) refer back to these measures.

   Sources: UNESCO World Heritage Centre

4. 2014-12
   Joint UNESCO World Heritage Centre / ICOMOS reactive monitoring mission (2-5 December 2014)

   The mission report said strong rains connected to El Niño Southern Oscillation were still one of the most serious threats to the site's physical integrity, noted that illegal occupation of agricultural lands and urban encroachment from Trujillo continued, found that the drainage system was controlling groundwater levels, and recommended maintaining the Danger List status pending full implementation of corrective measures.

   Sources: UNESCO World Heritage Centre / ICOMOS

5. 2017
   Coastal El Niño: UNESCO mission reports minimal damage

   Andina reported on 19 May 2017 that a UNESCO mission representative, Enrique Lopez-Hurtado, said that despite the scale of the disaster the damage at Chan Chan had been minimal, crediting prevention works. Andina cited works completed in 2014-2016 including 1,550 square metres of geoblock pavers and protective cover over 4,075 square metres. Figures are as reported by Andina; the mission report itself was not read.

   Sources: Andina (Peruvian state news agency)

6. 2019-08
   CyArk documents Chan Chan with LiDAR and photogrammetry

   CyArk's project page says documentation in August 2019 used LiDAR laser scanning, terrestrial photogrammetry and aerial drone photogrammetry, in collaboration with the Ministry of Culture through the La Libertad directorate and PECACH.

   Sources: CyArk

7. 2020-01-29
   Google Arts & Culture publishes Chan Chan 3D models and virtual tour

   Andina reported that Google Arts & Culture's 'Heritage on the Edge' exhibition, made with CyArk, ICOMOS and Peruvian partners including PECACH, presents 3D models and a 360-degree tour of Chan Chan alongside five other sites.

   Sources: Andina (Peruvian state news agency)

8. 2021
   Committee: widening the Trujillo ring road endangers the property (44 COM 7A.37)

   The Committee strongly urged Peru to improve the existing road or identify a new trajectory outside the property and buffer zone, urged a Heritage Impact Assessment, noted with regret that two essential corrective measures (buffer-zone delimitation and regulation, and implementation of amended Law 28261 on illegal occupation) had remained pending for several years, and retained the property on the Danger List. The Master Plan for Conservation and Management 2021-2031 is referred to in later decisions.

   Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

9. 2023-03
   March 2023 rain damages wall surfaces and protective covers

   UNESCO's 2024 state-of-conservation page reports works responding to damage caused by 'hurricane Yaku' in March 2023, with rainfall exceeding 20mm affecting wall surfaces and damaging protective covers, and conservation works in the Nik An, Chol An, Arco Iris and La Esmeralda complexes.

   Sources: UNESCO World Heritage Centre

10. 2023-10
    El Niño protection works at Nik An reported 40% complete

    Andina reported on 19 October 2023, quoting David Calderon de los Rios of the La Libertad culture directorate, that protection works funded with 11 million soles from the National Copesco Plan were 40% complete, including sacrificial material to protect original walls and floors from humidity and roofing of sections of the Nik An compound, with 80% targeted by late November. Figures and timeline are as stated by the directorate.

    Sources: Andina (Peruvian state news agency)

11. 2024-01
    Demolition orders reported against construction in the intangible zone

    El Buho reported that the Ministry of Culture's La Libertad directorate issued resolutions (8 and 17 January 2024) ordering demolition of buildings, parks and other structures built by a housing association on about 7 hectares of the intangible zone, with a fine and a 15-business-day deadline. Single-source; whether demolition was carried out was not verified.

    Sources: El Buho

12. 2024
    Committee decision 46 COM 7A.9: Danger List retained, two measures still pending

    The Committee noted that construction of the El Sol Highway through the property was halted, expressed regret that buffer-zone delimitation and implementation of amended Law 28261 remained pending for years, and decided to retain the property on the Danger List, requesting an updated report by 1 February 2025.

    Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

13. 2025-02-20
    Gestion reports about 600 square metres of intangible zone destroyed

    Gestion reported, citing David Calderon de los Rios, director of the La Libertad culture directorate, that about 600 square metres of intangible archaeological area in the Pampas de Alejandro sector were destroyed by invaders for farming and plot subdivision, that a police report was filed, that eviction operations were announced after six years of legal proceedings, and that adequate guarding would need at least 40 guards the directorate cannot afford.

    Sources: Gestion

14. 2025-05
    Graffiti sprayed on walls

    RPP reported that obscene drawings were spray-painted (RPP says on a Monday, i.e. 12 May; AFP, 13 May, says over the weekend) on three wall sections in the Gran Chimu sector's northern annex, and AFP reported the vandal was unidentified and not yet apprehended; the Ministry of Culture condemned the act and said investigations toward criminal charges had begun and that technical staff were sent to clean and restore the walls.

    Sources: RPP, CP24 (AFP)

15. 2025
    Committee decision 47 COM 7A.29: Danger List retained

    The Committee expressed concern at delays in incorporating buffer-zone regulations into the Metropolitan Urban Development Plan, urged Peru to conclude the amendment of Law 28261 with utmost priority, regretted 'severe delays', highly appreciated the Ministry of Transport and Communications' decision to contract preparation in 2025 of a Heritage Impact Assessment for the El Sol Highway section crossing the property, and retained the property on the Danger List, requesting a report by 1 February 2026. Session date within 2025 not confirmed.

    Sources: UNESCO World Heritage Centre

16. 2026
    Committee decision 48 COM 7A.35: Danger List retained

    The Committee commended implementation of the Master Plan 2021-2031 and emergency conservation at Nik An, Huaca Toledo, La Esmeralda, Arco Iris and Takaynamo, noted an inter-institutional working group developing a Disaster Risk Prevention and Reduction Plan (foreseen for completion in 2026), noted actions to regularise the status of pre-Hispanic properties in the buffer zone and encouraged Peru to finalise the process, noted the published and consulted draft regulation of Law 28261 and identification of land tenure overlaps, asked for information on the Cultural Heritage Impact Assessment of the Second Carriageway (Autopista del Sol) project including a potential alternative alignment, requested a report by 1 February 2027, and kept the property on the Danger List (also listed among retained properties in 48 COM 8C.2). The month of the 48th session was not confirmed in the sources read here.

    Sources: UNESCO World Heritage Centre, UNESCO World Heritage Centre

17. 2026-06
    ENFEN maintains El Niño Costero alert

    An IICA summary of ENFEN Official Communique No. 11-2026 (15 June 2026) says the El Niño Costero alert was maintained, with an event that began in March 2026 expected to continue at strong (48%) or moderate (46%) intensity into summer 2027, and urges risk-reduction measures before the September 2026-April 2027 rainy season. Forecast, not damage.

    Sources: IICA (Inter-American Institute for Cooperation on Agriculture) OPSAA

18. 2026-08/2026-09
    Peru's Culture Minister announces El Niño preparations including at Chan Chan

    El Peruano reported on 31 August 2026 that the Ministry allocated S/ 4 million for preventive measures, had identified 536 critical heritage points, and counted Chan Chan among the highest-risk archaeological sites, and on 3 September 2026 that Minister Alberto Beingolea inspected Chan Chan, saying a very strong El Niño is being warned about. El Buho (15 September 2026) reported an ENFEN statement of 14 September giving the greatest probability to 'extraordinary' magnitude between September 2026 and January 2027 (for December 2026-March 2027 it reports 48% extraordinary and 45% strong). Statements are the Ministry's and ENFEN's as reported; they are forecasts and preparedness, not documented damage.

    Sources: El Peruano, El Peruano, El Buho

Digital Preservation Index

Overall coverage: Extensive — Well documented across most or all digital preservation categories.

All five categories have publicly findable evidence, which meets the extensive tier by the rubric (at least four of five, including a visual and a technical/scholarly category). Coverage is uneven for a property of 1,414.57 ha: the 3D model actually opened (Google Arts & Culture / CyArk) covers the Audiencia in the Tschudi Palace (Nik An), and CyArk's page describes LiDAR, terrestrial and drone photogrammetry from August 2019 of the Tschudi and Rivero palace complexes, but its other models and tour sit on linked platforms that were not all opened; the 2020 Google exhibition was described by Andina as including a 360-degree tour, which was not independently opened here. The UNESCO gallery is modest (at least two pages of 12 images). The tier would still be extensive on the other four categories (photographic, archival, 3D, scholarly) even without the virtual tour, which was not opened here. A reviewer may wish to consider whether this unevenness, with 3D and tour coverage concentrated on a few complexes, should temper the tier toward moderate.

• Photographic

  UNESCO's World Heritage Centre hosts a public photo gallery for the property (at least two pages of 12 images, credited to UNESCO, Peru's Ministry of Culture and CRATerre), showing palaces, perimeter walls and the main square. Modest in size.

  View source
• Archival Records

  UNESCO maintains a public documents page for the property with decisions from 1986 to 2026, state-of-conservation reports from 1993 to 2026, the 1986 ICOMOS evaluation, the 2014 mission report and archaeological zone maps (2013, 1985); the 2014 mission report was opened.

  View source
• Three D Documentation

  Google Arts & Culture hosts an interactive 3D model of the Audiencia in the Tschudi Palace, and CyArk's project page describes LiDAR, terrestrial photogrammetry and drone photogrammetry captured in August 2019 at the Tschudi and Rivero palace complexes with the Ministry of Culture's La Libertad directorate and PECACH, with links to explore models in 3D.

  View source
• Three D Documentation

  CyArk's Chan Chan project page (August 2019 documentation) with links labelled 3D models, a tour and an exhibit; the models themselves are on linked platforms.

  View source
• Virtual Tour

  Andina reported on 29 January 2020 that Google Arts & Culture's 'Heritage on the Edge' exhibition includes 3D models and a 360-degree virtual tour of Chan Chan, made with CyArk, ICOMOS, the Ministry of Culture and PECACH; CyArk's project page (opened) also lists a 3D virtual tour option. The tour itself was not independently opened.

  View source
• Academic Scholarly

  Peer-reviewed and scholarly work exists, including the 2016 Arqueologica 2 conference paper on a multimedia museum exhibition using photogrammetry, orthophotos, AR and 3D models for Chan Chan, and the 2024 Dumbarton Oaks volume 'The Northern Dynasties: Kingship and Statecraft in Chimor', which examines the remains at Chan Chan.

  View source
• Academic Scholarly

  Dumbarton Oaks (Harvard) 2024 volume on Chimor, edited by Moseley and Cordy-Collins, examining the art, architecture and archaeology of Chan Chan and related sites; not confirmed to be open access.

  View source

Law and commitments

• Treaty record for Peru