Ground-water pumping has caused the water level in the Upper Floridan aquifer to decline throughout the entire coastal area, resulting in the development of cones of depression in areas of heavy, concentrated pumpage, such as the Savannah, Brunswick, Jesup, and St Marys, Georgia-Fernandina Beach, Florida, areas. Wells have ceased to flow at land surface in much of the coastal area. Many freshwater springs and seeps have ceased to discharge; freshwater wetlands and ponds that prior to development were sustained by flow from the Upper Floridan aquifer are no longer sustained by that flow. Although the cones of depression are deep, they do not intercept the top of the Upper Floridan aquifer; thus, dewatering or mining of water is not occurring. The pressure reduction has caused saltwater that is under higher pressure to flow into and contaminate the freshwater part of the aquifer in at least two locations—Brunswick, Georgia, and Hilton Head Island, South Carolina.