Lake Okeechobee, also known as Florida's Inland Sea, is the largest freshwater lake in the state of Florida. It is the ninth largest natural freshwater lake in the United States and the second largest natural freshwater lake contained entirely within the contiguous United States. Okeechobee covers 730 square miles (1,900 km2), approximately half the size of the state of Rhode Island, and is exceptionally shallow for a lake of its size, with an average depth of only 9 feet. The lake is divided between Glades, Okeechobee, Martin, Palm Beach, and Hendry counties. All five counties meet at one point near the center of the lake.