Region
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Western Hemisphere
4
Africa, Eastern
3
Amazon River Region
3
Asia, Central
3
Chile
3
Cuba
3
Developed countries
3
Ecuador
3
France
3
Illinois
3
Kenya
3
Laos
3
London
3
Mali
3
Mexico City
3
Nepal
3
New England
3
New York
3
Papua New Guinea
3
Pennsylvania
3
Persian Gulf Region
3
Peru
3
Philippines
3
Poland
3
Rotterdam
3
Russia (Federation)
3
Seattle
3
Senegal
3
Texas
3
Tropics
3
Washington (State)
3
Zimbabwe
3
Africa, East
2
Ajusco (Mexico)
2
Alaska
2
Amazon River Watershed
2
America
2
Andes Region
2
Aral Sea Watershed (Uzbekistan and Kazakhstan)
2
BRIC countries
2
Balkan Peninsula
2
Belgium
2
California
2
Cameroon
2
Campania
2
Caribbean, English-speaking
2
Carpathian Mountains
2
Central America
2
Chongming Qu (Shanghai, China)
2
Concord
2
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