Region
Australia
4
Malaysia
4
Asia
3
Asia --
3
South China Sea
3
Australia --
2
Baltic sea
2
United States
2
Antarctica
1
Antarctica --
1
Asia, Southeastern
1
Baltic Sea
1
Baltic Sea --
1
Baltic States
1
Baltic States --
1
Barents Sea
1
Barents Sea --
1
Bibliography
1
Developing countries
1
Indian Ocean Region --
1
Indonesia
1
Norway
1
Norway --
1
Pacific Area
1
Pacific Ocean
1
Sabah
1
South China Sea Region
1
Soviet Union
1
Soviet Union --
1
Svalbard
1