Region
United States
116
États-Unis
48
California
6
South Dakota
6
Dakota du Sud
5
New Mexico
3
North America
3
Oregon
3
Atlantic Ocean
2
Chesapeake Bay
2
Chesapeake Bay (Md. and Va.)
2
Developing countries
2
Grands Lacs, Bassin des (Amérique du Nord)
2
Great Lakes Watershed
2
Great Lakes Watershed (North America)
2
North Dakota
2
Nouveau-Mexique
2
Saint Lawrence River Watershed
2
Saint-Laurent, Bassin du
2
Washington (State)
2
West (U.S.)
2
West United States
2
Basse vallée du Rio Grande
1
Belle Fourche
1
Belle Fourche River
1
Belle Fourche River (Wyo. and S.D.)
1
Californie
1
Central Valley (Valley)
1
Chesapeake Bay Region
1
Chesapeake Bay Region (Md. and Va.)
1
Chesapeake, Baie de (Mar. et Virg.)
1
Columbia River Watershed
1
Dakota du Nord
1
Grande Vallée
1
Grande, Rio (Col.-Mexique et Tex.)
1
Hermiston
1
Hoover Dam
1
Hoover Dam (Ariz. and Nev.)
1
Hoover Dam (Ariz. et Nev.)
1
Idaho
1
Lower Rio Grande Valley
1
Maryland
1
Montana
1
Nebraska
1
Nevada
1
New York (State)
1
Northwest, Pacific
1
Oklahoma
1
Onondaga Lake
1
Onondaga Lake (N.Y.)
1
more ...