Region
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Delaware River Watershed (N.Y.-Del. and N.J.)
2
Erie, Lake
2
Eureka County
2
Florida Bay
2
Georgia
2
Glen Canyon (Utah and Ariz.)
2
Great Britain
2
Great Plains
2
Gulf States
2
Idaho
2
Klamath River Watershed (Or. and Calif.)
2
Lake Borgne
2
Mexico, Gulf of
2
Montana
2
New Mexico
2
North America
2
North Cascades (B.C. and Wash.)
2
Pennsylvania
2
Persian Gulf Region
2
Prince William Sound
2
Reserva de Biosfera Seaflower (Colombia)
2
Serengeti National Park Region
2
South Africa
2
Tanzania
2
Tropics
2
Whitman Mission National Historic Site
2
Whitman Mission National Historic Site (Wash.)
2
Africa
1
Africa, Southern
1
Alaska, Gulf of
1
Amazon River Valley
1
Antarctic Ocean
1
Apalachicola River
1
Apalachicola River Watershed
1
Appalachian Region
1
Appalachian Region, Southern
1
Arctic regions
1
Atlantic Coast (U.S.)
1
Baikal, Lake, Watershed (Russia)
1
Barbados
1
Bering Land Bridge National Preserve (Alaska)
1
Bermuda
1
Big Hole National Battlefield
1
Big Hole National Battlefield (Mont.)
1
Borneo
1
Brazil
1
Canaveral National Seashore
1
Canaveral National Seashore (Fla.)
1
Cape Krusenstern National Monument (Alaska)
1
Cascade-Siskiyou National Monument
1
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