Region
United States
Canada
7
California
4
West (U.S.)
4
France
3
New York
3
New York (State)
3
Europe
2
Great Plains
2
Illinois
2
Lyon
2
North America
2
Atlantic Coast (U.S.)
1
Dijon (France)
1
Florida
1
Germany
1
Great Britain
1
Gulf Coast (U.S.)
1
Hetch Hetchy Valley (Calif.)
1
Hoover Dam (Ariz. and Nev.)
1
Idaho
1
Japan
1
Los Angeles
1
Los Angeles (Calif.)
1
Mars (Planet)
1
Mexico
1
Nevada
1
Northwestern States
1
Oregon
1
Orlando
1
Outer space
1
Pennsylvania
1
Poland
1
San Francisco Bay Area
1
Santa Clara Valley (Santa Clara County, Calif.)
1
Tennessee-Tombigbee Waterway (Ala. and Miss.)
1
Vistula River Watershed
1
Willamette River Watershed
1
Wisconsin
1
Wyoming
1
Yucca Mountain
1