Southeast Georgia's Lower Coastal Plain, often referred to as the Coastal Empire, is a subregion that encompasses the lowest-lying areas of the Atlantic coastal plain in the state, containing barrier islands, marshes, and swampy lowlands, as well as flat plains and low terraces. It differs from Georgia's Upper Coastal Plain in that it is lower in elevation with less relief and wetter soils. The United States Environmental Protection Agency defines the Lower Coastal Plain as an ecoregion, part of the larger, interstate Southern Coastal Plain.