Region
Africa
29
Africa, East
1
Africa, Sub-Saharan
4
Ajusco (Mexico)
1
Algeria
1
Alps Region
1
Amazon River Region
1
Amazonas
1
America
1
Arctic regions
4
Asia
17
Asia, Central
1
Australia
4
Balkan Peninsula
4
Bangladesh
5
Belgium
1
Brazil
6
Canada
1
Canada, Northern
1
Caribbean Area
1
China
34
Columbia River Watershed
1
Costa Rica
2
Dakhla Oasis
1
Developing countries
28
East Asia
6
Ecuador
1
Egypt
3
Europe
14
Europe, Central
1
Europe, Eastern
1
Europe, Northern
1
European Economic Community countries
1
European Union countries
7
Florida
3
Florida Keys
1
Freiburg/Elbe
1
Germany
2
Ghana
1
Guangdong Sheng
1
Himalaya Mountains Region
1
Hong Kong
1
India
23
India, Northeastern
1
Indonesia
2
Iran
1
Islamic countries
4
Italy
2
Jamaica Bay (N.Y.)
1
Japan
8
more ...