Region
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Virginia
26
Wisconsin
26
Germany
25
Massachusetts
25
Great Lakes (North America)
24
Latin America
24
Brazil
23
European Union countries
23
Maryland
23
Missouri
22
Kansas
21
Tropics
21
Arctic National Wildlife Refuge
20
Gulf of Mexico
20
Kentucky
20
France
19
Gulf States
19
Alabama
18
Arctic regions
18
Black Hills National Forest (S.D. and Wyo.)
18
Ecuador
18
Southern States
18
Alberta
17
Gulf Coast (U.S.)
17
South Carolina
17
Umatilla National Forest (Or. and Wash.)
17
Amazon River Region
16
Indonesia
15
Maine
15
Peru
15
Pacific Ocean
14
Prince William Sound
14
Puerto Rico
14
Saint Helens, Mount (Wash.)
14
Six Rivers National Forest
14
Tongass National Forest (Alaska)
14
Wallowa-Whitman National Forest
14
Washington (D.C.)
14
Indiana
13
Mississippi
13
Navajo Nation, Arizona, New Mexico & Utah
13
Northeastern States
13
Arctic National Wildlife Refuge (Alaska)
12
Iowa
12
Antarctica
11
Caribbean Area
11
England
11
Glen Canyon Dam (Ariz.)
11
Gold King Mine (San Juan County, Colo.)
11
Hanford Site
11
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