Region
United States
19
France
4
Africa
3
Canada
3
Russia (Federation)
3
Utah
3
Asia
2
Europe
2
North America
2
West (U.S.)
2
Afghanistan
1
Africa, Southern
1
America
1
Antarctica
1
Arches National Park
1
Arches National Park (Utah)
1
Ashley Valley
1
Australia
1
California
1
Central America
1
Duchesne River Watershed
1
Earth (Planet)
1
Germany
1
Great Britain
1
Guatemala
1
Kansas
1
Korea (North)
1
Korea (South)
1
Mars (Planet)
1
Mexico
1
Nebraska
1
New Mexico
1
New York (State)
1
Oceania
1
Oregon
1
Paris
1
Polar regions
1
Russia
1
Saint Petersburg
1
San Francisco
1
South America
1
Tanzania
1
Willamette River Watershed
1
Willamette River Watershed (Or.)
1