One of the majors features of the outer coastal plain is the 681-square mile Okefenokee Swamp. The Okefenokee is the largest swamp in North America Okefenokee is a freshwater wetland. Once part of the Atlantic Ocean floor. The Swamp covers half million acres and is located in the Outer Coastal Plain near Waycross and Folkston. This primitive wetland is home to hundreds of species of plants, animals, and reptiles, many whom are endangered. Throughout the area about seventy piney woods islands, once home to Seminole Indians and settled by pioneer Georgians in the 1850s.