Region
United States
25
Alaska
6
Arizona
4
Colorado
4
Beaufort Sea
3
Chukchi Sea
3
Columbia Glacier
3
Florida
2
Kansas
2
Nevada
2
North America
2
North Carolina
2
Pinellas County
2
Puerto Rico
2
Assateague Island National Seashore (Md. and Va.)
1
Atlantic Coast (U.S.)
1
Buffalo Gap National Grassland
1
Buffalo Gap National Grassland (S.D.)
1
California
1
Canada
1
Core Sound
1
Elwha Dam (Wash.)
1
Elwha River
1
Elwha River (Wash.)
1
Ely
1
Four Corners Region
1
Glenwood Springs
1
Great Divide Basin
1
Gulf Coast (U.S.)
1
Hudson River (N.Y. and N.J.)
1
Idaho
1
Illinois
1
Indian River (Hamilton County and Essex County, N.Y.)
1
Iowa
1
Minnesota
1
Mississippi River
1
Mississippi River Valley
1
Missouri
1
Montana
1
Natrona County
1
New York (State)
1
Owyhee County
1
Rio Grande Valley (Colo.-Mexico and Tex.)
1
Rosebud County
1
Saguache County
1
San Pedro River Watershed (Mexico and Ariz.)
1
Serengeti National Park (Tanzania)
1
South Dakota
1
Southwest, New
1
Susitna River
1
more ...