Adventure Everglades 3D 2012. Everglades National Park lies in southern Florida, United States. Its subtropical forests, green wetlands, and freshwater reservoirs create a rare ecosystem that contains the largest freshwater swamp in the world. The calm waters are home to over 150 species of fish. The Florida manatee, also known as the sea cow, lives in the shallow areas. These peaceful and slow-moving animals are listed as endangered and draw hundreds of thousands of visitors each year from around the globe.