Region
United States
22
California
6
Washington (State)
5
Michigan, Lake
4
Middle West
4
Arizona
3
Erie, Lake
3
Florida
3
New Mexico
3
Oregon
3
Alaska
2
Cape Cod
2
Illinois Basin
2
Japan
2
Massachusetts
2
Nevada
2
North America
2
Portland Region
2
Puget Sound Region
2
Rio Grande Watershed (Colo.-Mexico and Tex.)
2
Utah
2
West (U.S.)
2
Albuquerque
1
Appalachian Basin
1
Arctic regions
1
Arkansas
1
Bemidji
1
Borah Peak Region
1
Canada
1
Cascade Range
1
China
1
Colorado
1
Colorado River Region (Colo.-Mexico)
1
Costa Rica
1
East (U.S.)
1
Europe, Northern
1
Great Lakes (North America)
1
Idaho
1
Idaho Springs
1
Kansas
1
Michigan, Lake, Watershed
1
Minnesota
1
Mississippi River Watershed
1
New York (State)
1
Northeastern States
1
Oklahoma
1
Pensacola
1
Potomac River
1
Puerto Rico
1
Puget Sound
1
more ...