Sinking Pond
Sinking Pond, a 394-acre site on Arnold Air Force Base that contains 149 acres of bottomland hardwoods, was designated a National Natural Landmark in 1975. Maximum winter water depth varies from a few inches to 15 feet in various parts of the site. But, the entire pond is usually dry in late summer and early fall. This area represents the largest and best developed overcup oak upland swamp in existence on the Highland Rim. It also contains one of the largest great blue heron rookeries in the state. (photo provided)