Region
United States
9
Earth (Planet)
3
Outer space
3
Developing countries
2
Hawaii
2
Mexico
2
North Pacific Ocean
2
South America
2
American Samoa
1
Atlantic Ocean
1
California
1
Calvert Cliffs
1
Cuatrociénegas
1
Flathead River, North Fork (B.C. and Mont.)
1
Florida
1
Henry Mountains
1
Henry Mountains (Utah)
1
Japan
1
Loxahatchee River
1
Loxahatchee River (Fla.)
1
Maryland
1
Mata Atlântica
1
Mexican-American Border Region
1
Montana
1
National Park of American Samoa (American Samoa)
1
North Atlantic Ocean
1
Pacific Coast
1
Solar system
1
Soviet Union
1
Tanzania
1
Tropics
1
Utah
1