World Heritage Identification Number: 410
World Heritage since: 1987
Category: Natural Heritage
WHE Type: Protected Areas & National Parks
Transboundary Heritage: No
Endangered Heritage: No
Country: 🇲🇽 Mexico
Continent: Americas
UNESCO World Region: Latin America and the Caribbean
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Sian Ka'an Biosphere Reserve: A Natural Treasure of the Yucatan Peninsula
The Sian Ka'an Biosphere Reserve, located on the eastern coast of the Yucatan Peninsula in Mexico, is a testament to the rich biodiversity and cultural heritage of the region. In the Mayan language, Sian Ka'an translates to 'Origin of the Sky', a fitting name for this vast expanse that encompasses tropical forests, mangroves, marshes, and a significant marine section intersected by the Mesoamerican Barrier Reef.
More to come…UNESCO Description of the World Heritage Site
In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means 'Origin of the Sky'. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system.
UNESCO Justification of the World Heritage Site
Criterion (vii): The aesthetics and beauty of Sian Ka´an derive from the relatively undisturbed interface of sea and land along a well-conserved coastline. The mosaic of landscape elements is diverse in shapes, forms and colours allowing intriguing views and impressions. Noteworthy and rare natural phenomena include the Cenotes, water-filled natural sinkholes hosting specialised communities of life and the Petenes, tree islands emerging from the swamps. Both are connected by underground freshwater systems, jointly forming an invaluable and fragile treasure for future generations.
Criterion (x): The scale and conservation status of Sian Ka'an and its ecosystem diversity support a fascinating range of life forms. Over 850 vascular plants, including 120 woody species, have been confirmed in what is assumed to be a still incomplete inventory. In terms of fauna, noteworthy representatives among the more than 100 documented mammals include endangered species like Black-handed Spider Monkey, Yucatan Black Howler Monkey and the Central American Tapir. A small population of the vulnerable West Indian Manatee occurs in the coastal waters. Some 330 bird species have been recorded, 219 of them breeding in Sian Ka'an. Amphibians and reptiles are represented by more than 40 recorded species, among them the vulnerable American Crocodile and four of the six turtle species found along the Mexican coast, all reproducing within the property. The isolation of some of the Cenotes led to the evolution of several species which are locally endemic to single sinkholes. With some 80 recorded species of reef-building coral the portion of the Mesoamerican Reef within the property is one of the richest in Mexico. Jointly with the many other aquatic habitats it harbours more than 400 species of fish and a wealth of other marine life.
Encyclopedia Record: Sian Kaʼan Biosphere Reserve
Sian Kaʼan Biosphere Reserve is a biosphere reserve in Tulum Municipality in the Mexican state of Quintana Roo. It was established in 1986 and became a UNESCO World Heritage Site in 1987.Additional Site Details
Area: 528,000 hectares
Number of Components: 1
(x) — Contains most important habitats for biodiversity
Coordinates: 19.38333 , -87.79167
IUCN World Heritage Outlook
The 2025 Conservation Outlook on Sian Ka'an reports the following assessment:
Source: International Union for Conservation of Nature (IUCN) · View assessment
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© Tschips, CC BY-SA 3.0 Resized from original. (This derivative is under the same CC BY-SA license.)
World Heritage Research
Discover scientific research and academic studies that deepen our understanding of Sian Ka'an from its history and significance to its conservation, management, and contemporary challenges.
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Carbon Stocks of Tropical Coastal Wetlands within the Karstic Landscape of the Mexican Caribbean
Coastal wetlands within the Sian Ka'an Biosphere Reserve (SKBR) in Mexico's Yucatan Peninsula store significant amounts of carbon, with tall mangroves holding the highest stocks at 987±338 Mg ha⁻¹. Soil carbon constitutes 78-99% of these stocks, indicating its critical role in ecosystem carbon storage. The study found that lower salinity and higher phosphorus levels in soils correlate with greater carbon sequestration potential, suggesting phosphorus limitation. Across the 172,176-ha reserve, coastal wetlands may store between 43.2 to 58.0 million Mg of carbon, underscoring their importance as a climate mitigation strategy. Researchers quantified ecosystem carbon stocks by measuring above and belowground biomass, downed wood, soil carbon, nitrogen, phosphorus, and interstitial salinity at nine sites within SKBR.
Adame, M. F., Kauffman, J. B., Medina, I., Gamboa, J. N., Torres, O., Caamal, J. P., Reza, M., & Herrera-Silveira, J. A. (2013). Carbon Stocks of Tropical Coastal Wetlands within the Karstic Landscape of the Mexican Caribbean. PLoS ONE, 8(2), e56569. https://doi.org/10.1371/journal.pone.0056569
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Estimates of exploitation rates of the spiny lobster fishery forPanulirus argusfrom tagging within the Bahía Espíritu Santo ‘Sian Ka'an’ Biosphere Reserve, Mexican Caribbean
A study of the Caribbean spiny lobster (Panulirus argus) fishery within Sian Ka'an Biosphere Reserve, Mexico, reveals high exploitation rates exceeding 0.94, driven by intensive fishing in shallow waters (≤20 m) due to gear restrictions. The research used a modified Brownie model to analyze tag recovery data from the 2010/2011 season, accounting for tag retention and reporting biases. Independent aquaria trials and fisher interviews refined estimates of mortality and catchability. Findings suggest that the 'casita/campo' system, which relies on fast-growing juveniles, sustains stable landings by enabling seasonal replenishment, despite high exploitation pressures.
Ley-Cooper, K., De Lestang, S., Phillips, B. F., & Lozano-Álvarez, E. (2013). Estimates of exploitation rates of the spiny lobster fishery forPanulirus argusfrom tagging within the Bahía Espíritu Santo ‘Sian Ka’an’ Biosphere Reserve, Mexican Caribbean. Marine Biology Research, 9(1), 88–96. https://doi.org/10.1080/17451000.2012.727434
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