Region
United States
160
Vermont
5
Alaska
4
European Union countries
4
California
3
Soviet Union
3
Afghanistan
2
China
2
Florida
2
Germany
2
India
2
Missouri
2
New York (State)
2
Alaska Peninsula
1
Alaska Peninsula (Alaska)
1
Alaska, Southwest
1
Aniakchak National Monument and Preserve (Alaska)
1
Arkansas
1
Broward County
1
Broward County (Fla.)
1
Cache River National Wildlife Refuge
1
Cache River National Wildlife Refuge (Ark.)
1
California Highway 49 (Calif.)
1
Canada
1
Cape Cod
1
Chesapeake Bay (Md. and Va.)
1
Chesapeake Bay Watershed
1
Cumberland Gap National Historical Park
1
Delta Junction Region
1
DuPage County
1
France
1
Greene County
1
Hawaii
1
High Plains
1
High Plains (U.S.)
1
High Plains Aquifer
1
Illinois
1
Katmai National Park and Preserve (Alaska)
1
Kenai Fjords National Park (Alaska)
1
Kilauea Volcano
1
Kilauea Volcano (Hawaii)
1
Lake Clark National Park and Preserve (Alaska)
1
Lake Tahoe Watershed
1
Long Island
1
Long Island (N.Y.)
1
Long Island City
1
Lower Rio Grande Valley (Tex.)
1
Maine
1
Mars (Planet)
1
Massachusetts
1
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