Region
Africa
1
Alaska
53
Albuquerque Region
1
Ambrosia Lake
1
Anchorage Region
1
Aquia Formation
1
Arizona
4
Arkansas
3
Atqasuk Region (Alaska)
1
Beaver River Watershed (Utah)
1
Biscayne Aquifer
1
Blying Sound Region
1
Bonsall Region
1
Broward County
1
Buffalo Bayou Watershed
2
California
5
California, Southern
2
Carbon County
1
Caribou County
1
Carter County
1
Carter County (Mont.)
1
Charles River
1
Charles River (Mass.)
1
China
1
Clear Creek County
1
Clinton County
1
Cochise County
1
Colorado
17
Columbia Plateau
1
Cordova Region
1
Cortland County
1
Costilla County
1
Costilla County (Colo.)
1
Cove Creek (Millard County and Sevier County, Utah)
1
Delta (Region)
1
Dillingham (Alaska)
1
Dillingham Region
1
Douglas County
1
Eagle County
1
Eagle County (Colo.)
1
El Paso County
5
Emery County
1
Fairbanks (Alaska)
1
Fairbanks Region
1
Fanning Springs Region
1
Florida
10
Floridan Aquifer
2
Fulton
1
Fulton (N.Y.)
1
Gem Valley
1
more ...