Region
United States
16
Europe
12
European Union countries
4
European Economic Community countries
3
Developing countries
2
Europe, Eastern
2
Japan
2
Mediterranean Region
2
Africa
1
Africa, West
1
Aral Sea Watershed (Uzbekistan and Kazakstan)
1
Asia
1
Baltic Sea
1
Bernina Alps (Italy and Switzerland)
1
Black Sea
1
Caribbean Area
1
Europe 1992
1
Europe, Central
1
Europe, Western
1
Frankfurt am Main (Germany)
1
Germany
1
Great Britain
1
Hyderabad
1
India
1
Kenya
1
Nairobi
1
North Atlantic Region
1
North Sea
1
Sahara
1
Soviet Union
1
Switzerland
1
Tel Aviv (Israel)
1