Trail Ridge
This ridge, interrupted only by major streams, extends south from the Altamaha River in Georgia to the Santa Fe River in Florida, a distance of 130 miles. It is an ancient barrier beach formerly many miles off-shore in the sea which covered this area during the Pleistocene, or last Ice Age. The top of the ridge is now about 160 feet above sea level and former a natural trail way for the Indians and early white settlers through the coastal lowlands.
WPA Marker - U.S. 84 B-7
Plaque courtesy Lat34North.com.
Original page, with additional info, here.
Photo credit: Byron Hooks of Lat34North.com.