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It is located in the south of the country, covering the Osa Peninsula. Due to its geographical position it is the natural end of dispersion of species from north and south, so it is a sample of the most representative of the ecological wealth of the country with scientific research value.

Its biodiversity is very rich in land and sea, endemic or endangered species (cats and birds) species. The remains of indigenous populations found evidence that the area was inhabited (particularly the Caño Island), which is considered an archaeological site.

The area protects and preserves outstanding resources such as tropical rainforest wet and very wet, rainy, archaeological features; sandy beaches, rocky cliffs, reefs, wetland ecosystems, spawning marine species, flora and fauna, etc.