Réigiún
United States
97
Washington (State)
13
West (U.S.)
13
New Mexico
12
California
10
Oregon
10
Great Basin
9
Nevada
9
Arizona
7
Chesapeake Bay (Md. and Va.)
7
Maryland
6
Alaska
5
Antarctica
5
Chesapeake Bay Region (Md. and Va.)
5
Colorado
5
Earth (Planet)
5
Idaho
5
Michigan, Lake
5
Middle Atlantic States
5
New York (State)
5
North America
5
Puget Sound Region
5
Canada
4
Erie, Lake
4
Japan
4
Kansas
4
Middle West
4
Oklahoma
4
Portland Region
4
Rio Grande Watershed (Colo.-Mexico and Tex.)
4
Utah
4
Virginia
4
Wyoming
4
Albuquerque Region
3
Appalachian Basin
3
Arctic regions
3
Atlantic Coast (U.S.)
3
Atlantic Ocean
3
Challis Region
3
Charleston
3
Chesapeake Bay
3
Espanola Valley
3
Florida
3
Mars (Planet)
3
Montana
3
Northeastern States
3
Pennsylvania
3
Puerto Rico
3
South Carolina
3
Southwest, New
3
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