Region
United States
873
Developing countries
4
Alaska
2
Southern States
2
Utah
2
Washington (D.C.)
2
Atlantic Ocean
1
Black Hills (S.D. and Wyo.)
1
California
1
California, Southern
1
Canada
1
Chesapeake Bay (Md. and Va.)
1
Davidson Seamount
1
Foreign countries
1
Grant-Kohrs Ranch National Historic Site
1
Grant-Kohrs Ranch National Historic Site (Mont.)
1
Hawaii
1
Mall, The (Washington, D.C.)
1
Milwaukee
1
Mississippi River
1
Mississippi River Valley
1
Montana
1
Monterey Bay National Marine Sanctuary
1
Mount Timpanogos Wilderness (Utah)
1
New Jersey
1
North Carolina
1
Pacific Ocean
1
South Atlantic Bight
1
Strawberry Valley (Wasatch County, Utah)
1
Texas
1
Travis County
1
Wisconsin
1