Region
United States
282
États-Unis
64
Colorado
52
California
23
Pennsylvania
21
India
19
New Jersey
17
Montana
16
France
14
Washington (State)
13
Japan
11
Alaska
9
England
9
Great Britain
9
Alamosa River Watershed
8
Georges Bank
7
Idaho
7
Puget Sound
7
San Juan County
7
Utah
7
West (U.S.)
7
Greece
6
Illinois
6
Nova Scotia
6
Pennsylvanie
6
Atlantic Ocean
5
Boston Harbor
5
Californie
5
China
5
Europe
5
Fort Collins
5
Massachusetts
5
Massachusetts Bay
5
Missouri
5
Pacific Ocean
5
Park County
5
Rio Grande County
5
Sacramento River
5
San Francisco Bay
5
South Carolina
5
Spain
5
Washington (État)
5
Alabama
4
Animas River Watershed (Colo. and N.M.)
4
Canada
4
Derbyshire
4
Germany
4
Hopewell Furnace National Historic Site
4
Huntsville Region
4
Italy
4
more ...