Region
United States
37
Colorado
7
Great Lakes (North America)
6
Kansas
5
California
4
Africa South of the Sahara
3
Oregon
3
Uncompahgre River Region
3
Amazon Creek (Or.)
2
Amazon Creek Watershed
2
Arkansas River Watershed
2
Asia
2
Australia
2
Chesapeake Bay Region (Md. and Va.)
2
China
2
Kansas River Watershed
2
Oceania
2
Oklahoma
2
Sacramento River
2
Uintah and Ouray Indian Reservation
2
Utah
2
Adak Island
1
Africa
1
Alaska
1
Animas River Watershed (Colo. and N.M.)
1
Appalachian Mountains
1
Arctic regions
1
Ashland
1
Asia, Southeastern
1
Atlantic Coast (America)
1
Beaufort Sea
1
Biscayne Bay
1
California, Southern
1
Cherokee County
1
Chesapeake Bay (Md. and Va.)
1
Coeur d'Alene River
1
Colorado River Delta
1
Colorado River Watershed (Colo.-Mexico)
1
Costa Rica
1
Earth
1
Erie, Lake
1
Europe
1
Florida
1
Fox River
1
Freezeout Lake
1
Georges Bank
1
Great Lakes Region (North America)
1
Greece
1
Green Bay (Wis. and Mich.)
1
Humboldt River Watershed
1
more ...