Sewanee Natural Bridge in Franklin County, Tennessee, is a 25 feet high natural sandstone arch with a span of 50 feet. It is essentially a giant sinkhole partially eroded to form a large stone bridge. A wet weather spring located behind the bridge in a rock cave probably contributed to the erosion forming the arch. Accessible from State Route 56 and located near the University of the South in the southwest section of the South Cumberland State Park, the Natural Bridge is only a short walk from the parking area. It is a 3-acre designated state natural area.