Region
Africa
3
Africa, Sub-Saharan
2
Alaska
8
Algeria
1
Appalachian Region
3
Arab countries
1
Arctic regions
2
Argentina
2
Arizona
1
Armenia
1
Asia
12
Asia, Central
2
Australia
2
Azerbaijan
1
Bengal, Bay of
2
Brazil
3
Bulgaria
1
C.C. Cragin Dam (Ariz.)
1
C.C. Cragin Reservoir (Ariz.)
1
California
10
Canada
9
Caribbean Area
2
Caspian Sea Lowland (Kazakhstan and Russia)
1
Caspian Sea Region
2
Chile
1
China
23
Colombia
3
Columbia River
7
Columbia River Valley
5
Developing countries
9
EPCOT Center (Fla.)
1
Earth (Planet)
2
East Asia
2
England
1
Europe
11
Europe, Eastern
2
European Economic Community countries
1
European Union countries
15
Florida
1
France
1
Great Britain
7
Guam
1
Gujarat
1
Hawaii
4
Hells Canyon (Idaho and Or.)
1
Iceland
1
India
13
Indonesia
3
Iowa
1
Iran
1
more ...