Region
North America
7
United States
4
Yellowstone National Park
4
Africa
2
Colorado
2
Idaho
2
South Dakota
2
Washington (State)
2
Wyoming
2
Alaska
1
Arctic National Wildlife Refuge
1
Arctic National Wildlife Refuge (Alaska)
1
Asia
1
Bear Lodge Mountains
1
Black Hills (S.D. and Wyo.)
1
Buffalo Gap National Grassland
1
Buffalo Gap National Grassland (S.D.)
1
Canada
1
Central Idaho Wilderness
1
China
1
East (U.S.)
1
Elwha River
1
Elwha River (Wash.)
1
Europe
1
Frank Church-River of No Return Wilderness
1
Great Lakes Region (North America)
1
Iran
1
Jewel Cave National Monument (S.D.)
1
Kenya
1
Latin America
1
Mexican-American Border Region
1
Mexico
1
Montana
1
Northeastern States
1
Olympic National Park
1
Southwest, New
1
Southwestern States
1
Texas
1
Tibet Autonomous Region
1
Tibet Autonomous Region (China)
1
Tibetan Plateau
1
Wind Cave National Park (S.D.)
1