Region
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Northeastern States
4
Northwest, Pacific
4
Russia
4
Singapore
4
Africa, Sub-Saharan
3
Caribbean Area
3
France
3
Guinea, Gulf of
3
Middle West
3
Minnesota
3
New England
3
New York (State)
3
Puerto Rico
3
Saudi Arabia
3
Sweden
3
Tehuantepec, Isthmus of
3
Venezuela
3
Adelaide (S.A.)
2
Afghanistan
2
America
2
Appalachian Region
2
Colorado
2
Connecticut
2
Cuba
2
Denmark
2
East China Sea
2
Indonesia
2
Israel
2
Korea (North)
2
Korea (South)
2
Malaysia
2
Mediterranean Sea
2
Mississippi
2
Ontario
2
Persian Gulf Region
2
Persian Gulf States
2
Rocky Mountains
2
Slovakia
2
South Africa
2
South America
2
South China Sea
2
Sudan
2
Tennessee
2
Thailand, Gulf of
2
Tibet Autonomous Region (China)
2
Africa, East
1
Africa, North
1
Afrika
1
Appalachian Region, Southern
1
Appalachian region
1
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