Region
Europe
36
United States
33
China
27
European Union countries
13
Great Britain
13
Developing countries
11
Africa
7
Asia
7
Germany
7
Japan
7
India
6
Congresses
4
Latin America
4
Pacific Area
3
Polar regions
3
Australia
2
Austria
2
Baltic Sea
2
Chesapeake Bay Region (Md. and Va.)
2
England
2
European Economic Community countries
2
France
2
Germany (West)
2
Indonesia
2
Italy
2
Moon
2
New Hampshire
2
Norway
2
South Asia
2
Southeast Asia
2
Sweden
2
Taiwan
2
Africa, Sub-Saharan
1
Alaska
1
Allemagne
1
Almería (Province)
1
Alpine regions
1
Arctic Ocean
1
Arctic regions
1
Arid regions
1
Balkan Peninsula
1
Baltic Coast
1
Black Sea
1
Black Sea Region
1
Bosnia and Herzegovina
1
Brazil
1
California
1
Canada
1
Caribbean Area
1
Caribbean islands
1
more ...