As the most biodiverse part of Costa Rica, the Osa Peninsula and the section of mainland along the Golfo Dulce have a number of protected areas. These nature parks are managed collectively under the Osa Conservation Area, which is responsible for keeping the gulf ecologically healthy. The second-largest park, Piedras Blancas, was once victim to severe logging. Now restored, it's an evergreen forest gem. The park's Osa Wildlife Sanctuary cares for injured and orphaned animals such as monkeys, sloths and toucans.