Everglades National Park is a protected area in Florida that covers 20% of the original Everglades. It is the largest subtropical wilderness in the US and the biggest wilderness east of the Mississippi River. Approximately one million individuals visit the park each year. Everglades is the third-largest national park in the contiguous United States, following Death Valley and Yellowstone. In 1976, UNESCO declared it a Biosphere Reserve and a World Heritage Site in 1979, and the Ramsar Convention listed it as a Wetland of International Importance in 1987. Moreover, it is one of the only three sites in the world to appear on all three lists.