Region
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Mexico
9
Navajo Nation, Arizona, New Mexico & Utah
9
Washington (D.C.)
9
England
8
Mississippi
8
New York
8
South Carolina
8
Arctic regions
7
Europe, Eastern
7
European Union countries
7
Gulf States
7
Kentucky
7
Missouri
7
Snake River Plain (Idaho and Or.)
7
Animas River Watershed (Colo. and N.M.)
6
Hudson River (N.Y. and N.J.)
6
Japan
6
London
6
Maine
6
Mississippi River
6
Morris County
6
Nebraska
6
New Mexico
6
Snake River Plain
6
Snake River Plain Aquifer
6
West (U.S.)
6
Afghanistan
5
Champlain, Lake
5
France
5
Ganges River (India and Bangladesh)
5
Los Angeles County Flood Control District (Calif.)
5
Middle West
5
New England
5
North Dakota
5
Northern Hemisphere
5
Ontario
5
Puget Sound
5
Rhode Island
5
San Francisco Bay
5
San Pedro Bay (Bay)
5
Southeast Asia
5
Suffolk County
5
Animas River (Colo. and N.M.)
4
Camp Lejeune
4
Chesapeake Bay Watershed
4
Colombia
4
Delaware
4
Denver Region
4
Dover Region
4
East (U.S.)
4
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