Region
Africa
6
Africa, North
1
Alaska
1
Asia
9
Asia, Central
3
Australia
1
Azerbaijan
2
Bengal, Bay of
2
Bulgaria
2
California
7
Cameroon
1
Canada
4
Caribbean Area
1
Caspian Sea Lowland (Kazakhstan and Russia)
1
Caspian Sea Region
2
Caucasus, South
1
China
15
Colombia
1
Developing countries
11
East Asia
3
Ethiopia
1
Eurasia
1
Europe
8
Europe, Eastern
6
Europe, Western
1
European Union countries
18
Former Soviet republics
3
Germany
4
Great Britain
7
Guatemala
2
Gulf States
1
Houston
2
India
6
Indonesia
3
Iran
3
Israel
1
Italy
1
Japan
3
Kazakhstan
1
Kentucky
1
Kola Peninsula
1
Korea (North)
1
La Guajira (Department)
1
Latin America
9
Louisiana
5
Mediterranean Region
1
Mexico
6
Michigan
1
Middle East
3
Mississippi
1
more ...