Okefenokee Swamp, a large freshwater swamp, mainly in southeastern Georgia and partly in northeastern Florida. A watery wilderness, the Okefenokee consists primarily of cypress forests, stands of pine, peat bogs, and inundated open grasslands called prairies. There are also numerous lily-filled lakes and winding waterways in the swamp. Total area is about 680 square miles (1,760 km2). Virtually the entire area is drained by the Suwannee River and its headwater branches.

The Okefenokee abounds in colorful flowering plants and is inhabited by a great variety of animals, including alligators, bears, deer, bobcats, ibises, herons, and five kinds of poisonous snakes. About 85 per cent of the swamp is within Okefenokee National Wildlife Refuge.

Okefenokee is a word of Indian origin and means "shaking earth." It refers to patches of boggy land in the swamp that shake or tremble when walked upon.