Location & Size: Puntarenas Province, S.W. side of Osa Peninsula on the Pacific coast. The National Park has: 54,039 Ha. (Terrestrial) and 2,400 Ha. (Maritime).

Characteristics: Rainiest and remotest region of the country.

Fauna:

• 140 species of mammals, with species such as: white-lipped peccary, howler and spider monkeys, squirrels, jaguar, tapir, etc.
• 367 species of birds, including: Scarlet macaws, king vulture, white hawk, short-billed pigeon, tovi parakeet, bronze-tailed sicklebill and Harpy Eagle.
• 117 amphibians and reptiles, among those are: crocodiles and sea turtles (nesting site:herbaceous swamp).
• 40 types of freshwater fish and 6,000 types of insect have been estimated

Flora: Montane forest, cloud forest, alluvial plains forest, swamp forest, holillo forest, freshwater herbaceous swamp, mangrove swamp and rock/sandy seashores. Around 500 tree species have been recorded, such as: purple heart, poponjoche, butternut tree, espavel, crabwood, nargusta, banak, silk cotton tree or ceiba (tallest tree in the country, over 70 mts. high), oaks, tree ferns.

Importance of the Park: Protection of the enormous biological diversity, which enables the park to be an ideal place for the study and research of the tropical rainforest. It also protects the largest population of scarlet macaws and other endangered species.

Visitor facilities: Park headquarters and trails.