Tehuacán-Cuicatlán Valley: originary habitat of Mesoamerica

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Tehuacán-Cuicatlán Valley: A Biodiverse Originary Habitat of Mesoamerica

The Tehuacán-Cuicatlán Valley, inscribed as a UNESCO World Heritage Site in 2018, stands out as a significant center of biodiversity in North America. This vast region, spanning over 490,186 hectares across 21 municipalities in the states of Puebla and Oaxaca, Mexico, is renowned for its rich flora, particularly its columnar cacti forests, which form some of the densest concentrations globally.

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UNESCO Description of the World Heritage Site

Tehuacán-Cuicatlán Valley, part of the Mesoamerican region, is the arid or semi-arid zone with the richest biodiversity in all of North America. Consisting of three components, Zapotitlán-Cuicatlán, San Juan Raya and Purrón, it is one of the main centres of diversification for the cacti family, which is critically endangered worldwide. The valley harbours the densest forests of columnar cacti in the world, shaping a unique landscape that also includes agaves, yuccas and oaks. Archaeological remains demonstrate technological developments and the early domestication of crops. The valley presents an exceptional water management system of canals, wells, aqueducts and dams, the oldest in the continent, which has allowed for the emergence of agricultural settlements.

UNESCO Justification of the World Heritage Site

Criterion (iv): The technological ensemble of water management of the Tehuacán-Cuicatlán Valley, along with other archaeological evidences such as the remains found in caves, plant domestication sites and agriculture, use of wild species, salt ponds and pottery, mark a stage of the utmost importance for the Mesoamerican region: the appearance and development of one of the oldest civilisations in the world. Located throughout the Valley, these technologies bear unique evidence of the constant adaptation of humans to the environment and reflect their innovative capacity to face the adverse environmental conditions in the area.

Criterion (x): The Tehuacán-Cuicatlán Valley demonstrates exceptional levels of biological diversity in an arid and semiarid zone in North America. A remarkable 70% of worldwide floral families are represented in the Valley, by at least one species, and the area is one of the main centres of diversification for the cacti family, which is highly threatened worldwide. A remarkable diversity of cacti exists within the property often in exceptional densities of up to 1,800 columnar cacti per hectare. The property exhibits particularly high diversity among other plant types, namely the agaves, yuccas, bromeliads, bursera and oaks. Worldwide, it hosts one of the highest animal biodiversity levels in a dryland, at least with regard to taxa such as amphibians, reptiles and birds. The property coincides with one of the most important protected areas worldwide for the conservation of threatened species encompassing over 10% of the global distribution range of four amphibian species, and is ranked as the one of the two most important protected areas in the world for the conservation of seven amphibian and three bird species. The biodiversity of this region has a long history of sustaining human development and today a third of the total diversity of the Tehuacán-Cuicatlán Valley, some 1,000 species, are used by local people.

Encyclopedia Record: Tehuacán-Cuicatlán Biosphere Reserve

The Tehuacán-Cuicatlán biosphere reserve is a protected natural area located in southeastern Mexico. Its name derives from its two main locations: Cuicatlán and Tehuacán, in the latter are their administrative offices, covers 490,186 hectares distributed among 21 municipalities in the state of Puebla and Oaxaca.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on Tehuacán-Cuicatlán Valley: originary habitat of Mesoamerica reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment