Region
Africa
3
Alaska
2
America
1
Antarctica
1
Arctic regions
1
Arizona
2
Asia
1
Atlantic Coast (North America)
1
Australia
1
Baltic States
1
Baton Rouge Region
1
Black Hills Region (S.D. and Wyo.)
1
California
2
Canada
3
Canada, Northern
1
Castle Valley (Emery County)
1
Central America
1
China
2
Colorado
7
Delaware River Watershed (N.Y.-Del. and N.J.)
1
Denver Basin
1
Developing countries
1
Earth (Planet)
1
East (U.S.)
1
England
1
Europe
6
Former Soviet republics
1
Garfield County
1
Great Britain
3
Great Plains
1
Great Salt Lake (Utah)
1
Greenland
2
Illinois
1
Illinois River
1
Illinois River (Ill.)
1
Ireland
1
Iron County
1
Israel
2
Jacks Fork
1
James River Watershed (N.D. and S.D.)
1
Jerusalem
2
Kansas
1
Latin America
1
Louisiana
2
Middle East
1
Missouri
1
Mohave, Lake (Ariz. and Nev.)
1
Moon
4
Moscow
1
Moscow (Russia)
1
more ...