Region
Alabama
1
Appalachian Region
1
Australia
2
Beaver Creek Watershed
1
Beaver Creek Watershed (Caroll County, Tenn.)
1
Bhopal
1
California
14
Canada
4
Cannonsville Reservoir Watershed
1
Cannonsville Reservoir Watershed (N.Y.)
1
Carroll County
1
Central America
1
Central Valley (Valley)
1
Channel Islands
1
Colombia
2
Columbia Plateau
2
Connecticut
1
Costa Rica
1
Delmarva Peninsula
1
Developing countries
3
Earth (Planet)
1
East Otter Tail County Soil and Water Conservation District
1
East Otter Tail County Soil and Water Conservation District (Minn.)
1
Erie, Lake, Watershed
1
Europe
1
Everglades National Park
1
Florida
4
Former Soviet republics
1
Georgia
1
Great Britain
3
Great Lakes Watershed (North America)
2
Hardeman County
1
Hawaii
3
Hopewell
1
Illinois
1
India
5
Kasaragod (District)
1
Kentucky
1
Kirkwood-Cohansey Aquifer
1
Kirkwood-Cohansey Aquifer (N.J.)
1
Lake Erie Watershed
1
Lake Michigan
1
Lake Saint Clair Watershed
1
Long Island
1
Long Island Sound (N.Y. and Conn.)
1
McKenzie River
1
McKenzie River (Or.)
1
Mesilla Valley
1
Mexico
2
Michigan, Lake
1
more ...