Region
United States
68
Florida
64
Everglades
39
Everglades (Fla.)
30
California
21
Gulf Coast (U.S.)
18
Louisiana
13
Great Lakes (North America)
11
Mexico, Gulf of
11
Chesapeake Bay (Md. and Va.)
10
Mississippi River Valley
9
Gulf States
8
Illinois
8
Illinois Waterway
7
Middle West
6
Salton Sea
6
Salton Sea (Calif.)
6
Tahoe, Lake, Watershed (Calif. and Nev.)
6
San Francisco Bay
5
Alaska
4
Tahoe, Lake (Calif. and Nev.)
4
Washington (State)
4
Alabama
3
Arizona
3
Australia
3
Colombia
3
Dauphin Island
3
East (U.S.)
3
Great Basin
3
Illinois Waterway (Ill.)
3
Iowa
3
Mexican-American Border Region
3
Missouri River
3
Missouri River Watershed
3
Montana
3
Nevada
3
North America
3
West (U.S.)
3
Wisconsin
3
Cajibío (Municipio)
2
Chesapeake Bay Watershed
2
China
2
Columbia River Watershed
2
Eureka County
2
Florida Keys National Marine Sanctuary
2
Galapagos Islands
2
Manchuria
2
Mekong River Watershed
2
Mongolia
2
Ohio
2
more ...