Region
United States
1,883
Washington (D.C.)
30
China
10
Iraq
9
California
8
Afghanistan
7
Puerto Rico
5
Africa South of the Sahara
4
Africa, Sub-Saharan
4
Arizona
4
Kosovo (Republic)
4
Libya
4
Utah
4
Alaska
3
Bosnia and Herzegovina
3
Chesapeake Bay Watershed
3
Cuba
3
Developing countries
3
Hawaii
3
Nevada
3
New Mexico
3
Virginia
3
West (U.S.)
3
Accomack County
2
Andes Region
2
Caribbean Area
2
Delta Region
2
Europe
2
Florida
2
Florida Keys
2
Huntington
2
Latin America
2
Louisiana
2
Massachusetts
2
Mexico, Gulf of
2
Minnesota
2
New York (State)
2
North Slope
2
Oregon
2
Pacific Ocean
2
Pakistan
2
Pennsylvania
2
Pontchartrain, Lake, Watershed (La.)
2
Serbia
2
Taiwan
2
Texas
2
Vieques Island
2
Washington (State)
2
Yugoslavia
2
Apache County
1
more ...