Region
United States
18
Antarctica
1
Bingham Copper Mine (Utah)
1
Bougainville Island (Papua New Guinea)
1
California
1
Canada
1
Castle Hot Springs (Ariz.)
1
Colorado
1
England
1
Europe
1
France
1
Maryland
1
Minnesota
1
Moon
1
New York
1
New York (N.Y.)
1
New York (State)
1
Panama
1
Papua New Guinea
1
Pittsburgh (Pa.)
1
Québec (Province)
1
Sri Lanka
1
Sudan
1
West (U.S.)
1
Wisconsin
1
Yellowstone National Park
1
Yosemite National Park (Calif.)
1