Region
United States
176
California
13
New Mexico
9
Washington (D.C.)
7
Haiti
6
Oregon
6
Utah
6
Washington (State)
6
Colorado
5
Idaho
4
Louisiana
4
Arizona
3
Developing countries
3
Nevada
3
North Carolina
3
Pennsylvania
3
Alaska
2
Canada
2
Chesapeake Bay Region (Md. and Va.)
2
Chimney Rock Archaeological Area (Colo.)
2
Great Lakes (North America)
2
Islamic countries
2
Marshall Islands
2
Ohkay Owingeh, New Mexico
2
Pakistan
2
Texas
2
Virginia
2
Zimbabwe
2
Afghanistan
1
Alpine Lakes Wilderness (Wash.)
1
Alta
1
American Falls Reservoir
1
Arctic Ocean
1
Atsugi-shi
1
Australia
1
Black Belt (Ala. and Miss.)
1
Blowing Rock (N.C.)
1
Blue Ridge Parkway (N.C. and Va.)
1
Box Elder County
1
Burma
1
C.C. Cragin Dam (Ariz.)
1
C.C. Cragin Reservoir (Ariz.)
1
California Coastal National Monument (Calif.)
1
Calleguas Municipal Water District
1
Calleguas Municipal Water District (Calif.)
1
Camp Hale (Colo.)
1
Camp Lejeune
1
Cane River National Heritage Area (La.)
1
Caribbean Area
1
Clark County
1
more ...