Region
Mississippi River
8
India
5
Great Britain
4
Arizona
3
Brazil
3
Tropics
3
Antarctica
2
Appalachian Mountains
2
Argentina
2
California
2
Canada
2
China
2
Cold regions
2
Colorado
2
England
2
Europe
2
Mediterranean Region
2
Montana
2
Nebraska
2
New Mexico
2
North America
2
Norway
2
Wales
2
Africa
1
Alaska
1
Antilles, Lesser
1
Arbuckle-Simpson Aquifer
1
Arbuckle-Simpson Aquifer (Okla.)
1
Atlantic States
1
Australasia
1
Australia
1
Austria
1
Balkan Peninsula
1
Bangladesh
1
Barbados
1
Bengal
1
Botswana
1
Breton Sound (La.)
1
California, Southern
1
Canada, Eastern
1
Canada, Northern
1
Canadian River
1
Cascade Lake Dam (Colo.)
1
Central America
1
Chickasaw National Recreation Area
1
Chickasaw National Recreation Area (Okla.)
1
Colorado Plateau
1
Copper River Valley
1
Costa Rica
1
Crazy Mountains
1
more ...