Region
Earth (Planet)
18
Utah
16
Colorado
15
Nevada
15
North America
12
West (U.S.)
11
Arizona
9
California
9
Montana
9
Alaska
8
California, Southern
8
Mexico
8
Washington (State)
7
Colorado Plateau
6
Idaho
6
Wyoming
6
India
5
Michigan
5
Missouri
5
New Madrid Region
5
New Mexico
5
Southwestern States
5
Alps
4
Andes
4
Antarctica
4
Appalachian Mountains
4
Australia
4
Himalaya Mountains Region
4
Kansas
4
Piceance Creek Basin
4
Southwest, New
4
Virginia
4
Atlantic Coast
3
Caribbean Area
3
Great Basin
3
Illinois
3
Middle West
3
Piceance Creek Basin (Colo.)
3
Rocky Mountains
3
Rocky Mountains Region
3
South Carolina
3
Tibetan Plateau
3
Uinta Basin (Utah and Colo.)
3
America
2
Asia, Central
2
Baja California (Peninsula)
2
Beaver Dam Mountains
2
British Columbia
2
California, Northern
2
Chesapeake Bay (Md. and Va.)
2
more ...