Region
European Union countries
11
United States
8
Erde
7
Europe
5
China
4
Africa
3
Developing countries
3
Southeast Asia
3
Brazil
2
Iran
2
Korea (North)
2
Russia (Federation)
2
Africa, Eastern
1
Amazon River Region
1
Arctic regions
1
Asia
1
Asia, Central
1
Australia
1
Bangladesh
1
Burundi
1
Ethiopia
1
Europe, Eastern
1
Grand Ethiopian Renaissance Dam (Ethiopia)
1
Great Britain
1
Group of Seven countries
1
Group of Twenty countries
1
Haiti
1
Heidelberg
1
Honduras
1
Indonesia
1
Korea (South)
1
Mittlerer Osten
1
Naher Osten
1
Nepal
1
Nile River Watershed
1
Nordafrika
1
South Africa
1
South China Sea
1
South China Sea Region
1
Study and teaching
1
Syria
1
Timor-Leste
1
Turkey
1
USA
1
Westliche Welt
1
Zimbabwe
1