Corcovado is found on the Pacific side of the Osa Penninsula, in the Province of Puntarenas. Founded in 1975 this park has a land area of 54,538.9 hectares and a maritime area of 2,400 hectares.

This park is located in what is refered to as the very wet tropical forest of the Pacific side of Costa Rica. As such it contains extraordinary botanical and zoological resources. It is considered an excellent laboratory for the study of the inter-relationships of the inhabitants of tropical ecosystems and the structure and functioning of said systems. In effect, this is the last great piece of undisturbed forest of this type left on the Pacific side of the Americas.

There are some 500 species of forest trees in the park, about a quarter part of all the tree species found in Costa Rica. The following habitants are found: montane forest, cloud forest, plains forest, swamp forest, palm swamp forest (yolillal), herbaceous swamp, mangrove forest, river & canal vegetation and beach vegetation.

In the park there are over 100 species of mammals, 370 species of birds, 115 reptiles including anphibians and about 40 species of fresh water fish.