Area de Conservación Guanacaste

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Area de Conservación Guanacaste: A Biodiverse Haven in Costa Rica

The Area de Conservación Guanacaste (ACG) is a remarkable testament to Costa Rica's commitment to preserving its rich biodiversity. Inscribed as a UNESCO World Heritage Site in 1999, this expansive network of protected areas spans over 238,000 hectares in the northwestern province of Guanacaste.

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UNESCO Description of the World Heritage Site

The Area de Conservación Guanacaste (inscribed in 1999), was extended with the addition of a 15,000 ha private property, St Elena. It contains important natural habitats for the conservation of biological diversity, including the best dry forest habitats from Central America to northern Mexico and key habitats for endangered or rare plant and animal species. The site demonstrates significant ecological processes in both its terrestrial and marine-coastal environments.

UNESCO Justification of the World Heritage Site

Criterion (ix): A striking feature of Area de Conservación Guanacaste is the wealth of ecosystem and habitat diversity, all connected through an uninterrupted gradient from the Pacific Ocean across the highest peaks to the lowlands on the Caribbean side. Beyond the distinction into land and sea, the many landscape and forest types comprise mangroves, lowland rainforest, premontane and montane humid forest, cloud forest, as well as oak forests and savannahs with evergreen gallery forests along the many water courses. Along the extraordinary transect the property allows migration, genetic exchange and complex ecological processes and interactions at all levels of biodiversity, including between land and sea. The vast dry forest is a rare feature of enormous conservation value, as most dry forests elsewhere in the region are fragmented remnants only. Conservation has permitted the natural restoration of the previously degraded forest ecosystem, today serving again as a safe haven for the many species depending on this acutely threatened ecosystem. Major nutrient-rich cold upwelling currents offshore result in a high marine productivity and are the foundation of a diverse coastal-marine ecosystem containing important coral reefs, algal beds, estuaries, mangroves, sandy and cobble beaches, shore dunes and wetlands.

Criterion (x): The property is globally important for the conservation of tropical biological diversity as one of the finest examples of a continuous and well-protected altitudinal transect in the Neotropics along a series of marine and terrestrial ecosystems. The enormous variation in environmental conditions favours a high diversity, with two thirds of all species described for Costa Rica occurring within the relatively compact area. Coexisting in the property, there are more than 7,000 species of plants, as diverse as Mahogany in the lush forests and several species of agaves and cacti in drier areas. Over 900 vertebrates have been confirmed. Some notable mammals include the endangered Central American Tapir, at least 40 species of bat, Jaguar, Margay, Jaguarundi and Ocelot, as well as numerous primate species. Among some 500 bird species are the endangered Mangrove Hummingbird and Great Green Macaw, and the vulnerable Military Macaw. Charismatic representatives of reptiles include the vulnerable American Crocodile and the Spectacled Caiman. Several species of sea turtles occur in the property, with the critically endangered Leatherback nesting and a massive breeding population of the vulnerable Olive Ridley. Invertebrate diversity is extraordinary with an estimated 20,000 species of beetles, 13,000 species of ants, bees and wasps and 8,000 species of butterflies and moths.

Encyclopedia Record: Area de Conservación Guanacaste World Heritage Site

The Area de Conservación Guanacaste is a network of protected areas and a World Heritage Site in Guanacaste Province, in northwestern Costa Rica. The World Heritage Site contains an unbroken tract of tropical dry forest and important habitat for several vulnerable species, including the Central American tapir, mangrove hummingbird, and the great green macaw. Over 7,000 plant species and 900 vertebrate species have been located in the park.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on Area de Conservación Guanacaste reports the following assessment:

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