Region
United States
57
European Union countries
48
China
26
Europe
25
India
14
Islamic countries
13
Japan
8
Australia
7
Germany
6
Africa
5
Great Britain
4
Arctic regions
3
Asia
3
Developing countries
3
Italy
3
Bangladesh
2
Brazil
2
European Economic Community countries
2
Mexico
2
Spain
2
Sweden
2
Switzerland
2
Turkey
2
Aegean Islands (Greece and Turkey)
1
Africa, Sub-Saharan
1
America
1
Antarctic Ocean
1
BRIC countries
1
Balkan Peninsula
1
Baltic Sea
1
Canada
1
Caribbean Area
1
Catalonia
1
Costa Rica
1
Cunene River (Angola and Namibia)
1
England
1
Eurasia
1
Finland
1
Ganges River (India and Bangladesh)
1
Ganges River Watershed (India and Bangladesh)
1
Group of Twenty countries
1
Indian Ocean Region
1
Indonesia
1
Katse Dam (Lesotho)
1
Korea
1
Kyrgyzstan
1
Lesotho
1
Malaysia
1
Mediterranean Region
1
Mekong River Delta (Vietnam and Cambodia)
1
more ...