Region
United States
123
Colorado
39
California
34
Arizona
28
Nevada
19
Washington (State)
18
Texas
16
New Mexico
15
Alaska
14
Idaho
13
Florida
12
Black Mesa (Navajo County and Apache County)
9
New York (State)
9
North America
9
Utah
9
Oregon
8
China
7
Missouri
7
Montana
7
New Jersey
7
Virginia
7
Germany
6
North Dakota
6
Wyoming
6
Yucca Mountain
6
Atlantic Coast (U.S.)
5
Earth (Planet)
5
Georgia
5
Great Britain
5
Great Plains
5
Illinois
5
Kansas
5
Maryland
5
Massachusetts
5
Naval Undersea Warfare Engineering Station
5
Hawaii
4
High Plains Aquifer
4
Humboldt River Watershed
4
Maine
4
Michigan, Lake
4
Nebraska
4
Russia (Federation)
4
Snake River Plain (Idaho and Or.)
4
Taos County
4
West (U.S.)
4
Wisconsin
4
Africa
3
Arctic regions
3
Columbia Plateau
3
Earth
3
more ...