Region
United States
1,616
California
58
Washington (D.C.)
49
New Mexico
33
Oregon
27
Arizona
25
Washington (State)
23
Utah
21
Colorado
20
Hawaii
19
Idaho
18
Alaska
16
Wyoming
15
Florida
14
Texas
14
Iraq
12
Nevada
12
Louisiana
11
Virginia
11
South Dakota
10
West (U.S.)
10
Connecticut
9
Gulf States
9
Iran
9
New York (State)
9
Massachusetts
8
Montana
8
Nebraska
8
North Carolina
8
Pennsylvania
8
Missouri
7
Oklahoma
7
Developing countries
6
New York
6
Tennessee
6
Burma
5
Chile
5
Denmark
5
Georgia
5
Grand Teton National Park (Wyo.)
5
Maryland
5
Michigan
5
New Jersey
5
Puerto Rico
5
Washington Metropolitan Area
5
Arkansas
4
Barataria Preserve (La.)
4
California, Southern
4
Canada
4
Colorado River Watershed (Colo.-Mexico)
4
more ...