Region
United States
22
California
9
Nevada
9
Kansas
8
Utah
8
Florida
6
Arkansas
5
Illinois
5
New York (State)
5
North Dakota
5
Tennessee
5
Alaska
4
Colorado
4
Idaho
4
Minnesota
4
Ohio
4
Oklahoma
4
Pennsylvania
4
South Dakota
4
Developing countries
3
Iowa
3
Montana
3
New Mexico
3
North Carolina
3
Oregon
3
Washington (State)
3
Wisconsin
3
Wyoming
3
Georgia
2
Kentucky
2
Kern County
2
Logan County
2
Los Angeles County
2
Massachusetts
2
Nebraska
2
Northwest, Pacific
2
Texas
2
Africa
1
Alabama
1
Albuquerque
1
Arizona
1
Arkansas River Watershed
1
Atlantic States
1
Brooks Range
1
China
1
Clyde River
1
Columbia River Watershed
1
Connecticut River Watershed
1
Crook County
1
Crooked River
1
more ...