Region
Florida
3
United States
3
Georgia
2
Lake Mead National Recreation Area (Ariz. and Nev.)
2
New Mexico
2
Rhode Island
2
Rio Grande Valley (Colo.-Mexico and Tex.)
2
Albuquerque
1
Albuquerque Region
1
California
1
Chenango County
1
Clinton
1
Dakhla Oasis
1
Egypt
1
Flathead Indian Reservation
1
Hillsborough County
1
Hillsborough County (Fla.)
1
Hutchinson County
1
Illinois
1
Montana
1
Nevada
1
New York (State)
1
North Carolina
1
Rio Grande Watershed (Colo.-Mexico and Tex.)
1
South Dakota
1
Turner County
1