Region
Developing countries
10
Africa
8
Europe
7
Latin America
5
China
2
Mediterranean Region
2
North America
2
Africa, Southern
1
Amazon River Watershed
1
Arab countries
1
Bangladesh
1
Caribbean Area
1
Central Europe
1
Eastern Europe
1
Europe, Central
1
Middle East
1
Rhine River Watershed
1
South Asia
1
Tropics
1