Tortuguero National Park is a national park in the Limón Province of Costa Rica. It is situated within the Tortuguero Conservation Area of the northeastern part of the country. Despite its remote location, reachable only by airplane or boat, it is the third-most visited park in Costa Rica. The park has a large variety of biological diversity due to the existence within the reserve of eleven different habitats, including rainforest, mangrove forests, swamps, beaches, and lagoons. Located in a tropical climate, it is very humid, and receives up to of rain a year. The park, a protected area within the northeastern Caribbean wetlands, was recognized under Ramsar Convention on 3 March 1991 for its rich biological diversity and ecosystems that support threatened flora and fauna species. Set in a natural wetland of the Caribbean coast, it forms a corridor with another protected area, the Indio Maíz Biological Reserve of Nicaragua. It is a key Ramsar Site. Geography The park is located on the Caribbean coast of Costa Rica and covers an area of . It is bounded with an elevation range of , indicative of a sea coastal region to low hilly topography. The Tortuguero National Park has over 20 miles of coastline, which provides sea turtles a protected place to lay their eggs. Tortuguero is bordered on the north by the Barra del Colorado Wildlife Refuge (with habitats and climate similar to Tortuguero), to the south by the mouth of the Parismina River and the Cariari National Wetlands, the town of Tortuguero at the mouth of the Tortuguero River, and the Dr. Archie Carr Wildlife Refuge, which is a biological station to carry out turtle tagging program run by the Caribbean Conservation Corporation (Now known as the Sea Turtle Conservancy). While volcanic activity is reported as the formation of a group of small islands, erosion has created the depressions which have a permeable base of "light grey, broken lava rocks, with harder rocks and grey or dark grey lavas overlying". Sandy soils resulting from sedimentation dominate the reserve with the formation of parallel bars in the coastal area. The depressions are subject to filling by ephemeral floods; estuary lakes, grassy marshes, and wooded swamps caused by very heavy rainfall. Small tides of about height have also affected the coastal zone. The small rivers and streams that originate in the hills and flow through the park generally have water deep.