This conservation area in northwestern Costa Rica contains a mosaic of diverse ecosystems from the Pacific shores to the lowland rain forests in the Caribbean basin. It is comprised of four contiguous protected areas, containing important terrestrial and marine-coastal environments and key habitats.
Arenal National Park is located in Alajuela province in northwestern Costa Rica. The park encompasses the Arenal Volcano, an active andesitic stratovolcano. It was Costa Rica's most active volcano until 2010 and one of the ten most active volcanoes in the world.
Arrecife Alacranes (Scorpion Reef) is a reef surrounding a small group of islands off the northern coast of Yucatán, Mexico. Designated a national park and biosphere reserve, it is the largest reef in the southern Gulf of Mexico and the only known coral reef in the Yucatán.
Barbilla National Park is located on the eastern slopes of the Cordillera de Talamanca in Costa Rica, within the Caribbean La Amistad Conservation Area. The park protects humid lowland rain forest along the Caribbean slopes of the Talamancan mountain range.
Barra Honda National Park is located in western Costa Rica and is part of the Tempisque Conservation Area. It was created in 1974 to protect its famous cave systems under the Barra Honda Peak which was formed when islets from the Miocene Era were raised above the plains of the river.
The Cacique Lempira, Señor de las Montañas Biosphere Reserve, which includes Celaque National Park, is located in the western part of Honduras. The ecosystem is primarily cloud forest and includes Cerro las Minas, the highest mountain in Honduras.
The Chamela-Cuixmala Biosphere Reserve hosts a wide variety of ecosystems that make up one of the most diverse landscapes on the Pacific coast of the Americas. It is important for the conservation of the wide, dry, and deciduous tropical forest — considered among the world's most threatened ecosystems.
Chirripó National Park is named for its most prominent feature, Cerro Chirripó, the highest mountain in Costa Rica. Five ecosytems found in the park include lowland tropical wet forest, premontane tropical wet forest, lower montane wet forest, montane wet forest and subalpine wet forest (páramo).
Cocos Island lies off the Pacific coast of Costa Rica and is the only island in the tropical eastern Pacific with a tropical rain forest. Surrounded by deep waters with counter-currents, Cocos Island National Park is admired by scuba divers for its populations of large marine species.