Congaree Swamp harbors the last major tract of virgin southern bottomland in the southeastern United States. (Bottomland is low-lying grassland along a water course.) It is located off Highway 48, southeast of Columbia, on a bluff on the Congaree River. (A bluff is a high, steep bank). The Congaree Swamp has been referred to as 'The Land of Giants' because of the towering trees that grow there.