Region
United States
2,620
États-Unis
699
Washington (D.C.)
34
Iraq
29
California
21
Montana
18
Northwest, Pacific
18
Florida
17
Outer space
17
West (U.S.)
17
Nevada
16
Georgia
15
New York (State)
14
Oregon
14
Apalachicola River Watershed
13
New York
12
Alaska
11
Idaho
11
North America
11
Afghanistan
10
Alabama
10
Alabama River Watershed
10
Chattahoochee River Watershed
10
Coosa River Watershed (Ga. and Ala.)
10
Flint River Watershed
10
Ohio
10
Tallapoosa River Watershed (Ga. and Ala.)
10
Virginia
10
Yucca Mountain
10
Mexican-American Border Region
9
Arizona
8
Utah
8
Wyoming
8
Colorado
7
Great Lakes Watershed (North America)
7
Irak
7
Northeastern States
7
Saint Lawrence River Watershed
7
Washington (State)
7
West United States
7
Hawaii
6
Louisiana
6
Région frontalière mexicano-américaine
6
Atlanta
5
China
5
Espace extra-atmosphérique
5
Géorgie (État)
5
Latin America
5
Maryland
5
Mexico, Gulf of
5
more ...