Geospatial (GIS) and Map Resources for the South Atlantic Region

USGS:
WaterWatch (Current Streamflow):    Georgia  |  North Carolina  |  South Carolina
National Geospatial Program  |  Spatial data sets available on the WRD NSDI node  |  The National Map  |  Spatial data sets available on the WRD NSDI node
National Hydrography Dataset  |  National Elevation Dataset  |  National Land Cover Database  |  Geographic Names Information System (GNIS)

National:
National Geospatial Advisory Committee  |  Open Geospatial Consortium  |  National States Geographic Information Council  |  National Hydrography Dataset Plus  |  Watershed Boundary Dataset

Georgia: Georgia GIS Clearinghouse 

North Carolina:  NC Center for Geographic Information and Analysis  |  NC Geographic Information Coordinating Council  |  NC One Map  |  NC Stream Mapping Program  |  NC Floodplain Mapping
NC State GIS Library  |  NC Department of Transportation GIS 

South Carolina: SCDOT GIS & Maps  |  S.C. Department of Natural Resources  |  S.C. Department of Health and Environmental Control