Region
United States
66
California
5
Montana
5
Clark Fork Watershed (Mont. and Idaho)
3
Florida
3
Nevada
3
North America
3
Northwest, Pacific
3
Yellowstone National Park Region
3
Alaska
2
Atlantic Ocean
2
Bering Sea
2
Florida Bay
2
Mexico, Gulf of
2
San Francisco Bay
2
Utah
2
Atlantic Coast (U.S.)
1
Atlantic States
1
Beaufort Sea
1
Escalante River
1
Europe, Eastern
1
Florida Bay (Fla.)
1
Former Soviet republics
1
Galveston Region
1
Glen Canyon National Recreation Area (Utah and Ariz.)
1
Great Plains
1
Houston Region
1
Idaho
1
Lake States
1
Looe Key National Marine Sanctuary
1
Maryland
1
Mississippi River
1
Missouri
1
Missouri River
1
Montgomery County
1
Muddy River
1
North Dakota
1
North Pacific Ocean
1
Northeastern States
1
Norton Sound Region
1
Oregon
1
Payette National Forest
1
Prairie Pothole Region
1
Puerto Rico
1
San Francisco Bay (Calif.)
1
San Francisco Bay Area
1
Soviet Union
1
Texas
1