Swamp of Toa. Photo courtesy of Chip Evans, Lenz Design and Communications, Inc.

Wilson Blue Spring south of Albany. Water discharges from
the Upper Floridan aquifer into the Flint River. Photo by Debbie Warner, USGS

Climax Cave in the lower Flint River subbasin. Photo by Alan M. Cressler, USGS

Water from the Upper Floridan aquifer forms a pool in Climax Cave, Grady County. The crystal- clear pool is about 10 feet in diameter and 8 feet deep. Water levels fluctuate as much as 5 feet. Caves are common in karst areas, such as the lower Flint River subbasin, causing much of the drainage to go underground.