Region
United States
1,228
Oregon
21
Colorado
18
New Mexico
18
Alaska
16
Arizona
11
Idaho
10
Mexico, Gulf of
10
Wyoming
10
Canada
9
Atlantic Coast (U.S.)
8
California
8
Nevada
8
Utah
8
Illinois
6
Montana
6
Northeastern States
6
West (U.S.)
6
Gulf Coast (U.S.)
5
North Dakota
5
Ohio
5
Texas
5
Washington (D.C.)
5
Arkansas
4
Kansas
4
New York (State)
4
South Dakota
4
Washington (State)
4
Yellowstone National Park
4
Atlantic States
3
Caribbean Area
3
Colorado River Watershed (Colo.-Mexico)
3
Great Lakes (North America)
3
Gulf States
3
Hawaii
3
Japan
3
Michigan
3
Middle West
3
North America
3
Pennsylvania
3
Rocky Mountains Region
3
Wisconsin
3
Alabama
2
Atlantic Ocean
2
China
2
Coos Bay Region
2
Georgia
2
Great Basin
2
Iowa
2
Los Alamos
2
more ...