Region
Colorado
24
New Mexico
14
Utah
12
Florida
11
United States
10
Oklahoma
9
Montana
8
New Jersey
8
Ohio
7
Arizona
6
California
6
Indiana
6
Massachusetts
6
North Carolina
6
Pennsylvania
6
Alaska
5
Hawaii
5
Illinois
5
Kansas
5
Kentucky
5
Michigan
5
Nevada
5
Tennessee
5
West Virginia
5
Wyoming
5
Jefferson County
4
Minnesota
4
Nebraska
4
New York (State)
4
South Dakota
4
Texas
4
Alabama
3
Arkansas
3
Black Hills (S.D. and Wyo.)
3
Connecticut
3
Floridan Aquifer
3
Georgia
3
Idaho
3
India
3
Louisiana
3
Missouri
3
New Hampshire
3
Nile River Watershed
3
North Dakota
3
West (U.S.)
3
Wisconsin
3
Africa, Sub-Saharan
2
Cumberland County
2
Delaware
2
Grant County
2
more ...