Region
Adams County
1
Ajo Region
1
Alameda County
1
Alaska
10
Alaska Range
1
Amargosa Desert (Nev. and Calif.)
1
Antarctica
3
Apache County
1
Arctic Ocean
1
Argentina
1
Arizona
16
Arkansas
1
Asia
1
Atlantic Coast
1
Atlantic Coast (U.S.)
2
Australia
1
Baker County
1
Barstow Region
2
Blackfoot Region
2
Blue Mountains (Or. and Wash.)
1
Blue Mountains Region (Or. and Wash.)
1
Bonneville, Lake
2
Cache County
1
Cache Valley (Utah and Idaho)
1
California
52
California, Northern
1
California, Southern
1
Cascade Range
1
Chelan County
1
Chihuahua (State)
1
China
1
Churchill County
2
Coast Range
2
Coast Ranges
3
Colorado
12
Colorado Plateau
2
Colorado River Region (Colo.-Mexico)
2
Custer County
1
Death Valley Region (Calif. and Nev.)
1
Delaware
1
Delmarva Peninsula
4
Devils Postpile National Monument (Calif.)
1
Devils Postpile National Monument Region
1
Elephant Butte Reservoir Region
1
Feather River Region
2
Fish Lake Region
1
Fish Lake Valley
1
Fisher Valley
2
Flagstaff Region
2
Florida
1
more ...