Region
United States
488
Developing countries
20
Africa
18
Colorado
17
West (U.S.)
17
New Mexico
14
Arizona
13
Australia
13
Montana
12
Texas
10
Idaho
9
Kansas
9
Northeastern States
9
Tropics
9
Oklahoma
8
Utah
8
Alaska
7
Colombia
7
Tennessee
7
California
6
China
6
Hawaii
6
India
6
Mexico
6
Washington (State)
6
Wisconsin
6
Cibola National Forest
5
Cibola National Forest (N.M.)
5
Minnesota
5
New York (State)
5
North America
5
Pennsylvania
5
Southeast Asia
5
White River National Forest
5
White River National Forest (Colo.)
5
Africa, Southern
4
England
4
Florida
4
Middle West
4
Oregon
4
Peru
4
Virginia
4
West Virginia
4
Yellowstone National Park
4
Amazon River Region
3
Asia
3
Brazil
3
Chesapeake Bay (Md. and Va.)
3
Great Barrier Reef (Qld.)
3
Great Lakes (North America)
3
more ...