One and a half million acres of shallow-water marine habitats, freshwater marshes and prairies, saltwater wetland forests, and pine and hardwood forests provide refuge for threatened and endangered animals in the Gulf of Mexico. The green sea turtle, American crocodile, West Indian manatee, Everglade snail kite, and piping plover all depend on critical habitat within Everglades National Park. 1.3 million acres of the park is designated wilderness, making it the largest subtropical wilderness in the United States and the largest wilderness area east of the Mississippi River.