One of the last remaining stretches of lowland rainforest on the Pacific, Piedras Blancas is home to a mindboggling array of flora and fauna, including many of Costa Rica's most exciting animals: pumas, jaguars, monkeys, two-toed sloths and numerous species of bats. Dozens of species of migrating birds stop by here also. According to a study conducted at the biological station at La Gamba, the biodiversity of trees in Piedras Blancas is the densest in all of Costa Rica, even surpassing Corcovado.
Consisting of parcels of land purchased by benefactors as diverse as the Nature Conservancy and the Austrian government, this national park was established in 1992 as an extension of Parque Nacional Corcovado, though it's now an independent entity. Piedras Blancas has 120 sq km of undisturbed tropical primary rainforest, as well as 20 sq km of secondary forests, pastureland, coastal cliffs and beaches.