Region
United States
37
Colorado
2
Developing countries
2
Hawaii
2
Nevada
2
Northwest, Pacific
2
Utah
2
California
1
Canada
1
Caribou-Targhee National Forest
1
Chicago Metropolitan Area
1
Four Corners Region
1
Georgia
1
Idaho
1
Illinois
1
Iowa
1
Louisiana
1
Mexico
1
New Mexico
1
New York (N.Y.)
1
North Dakota
1
Saudi Arabia
1
Valles Caldera National Preserve (N.M.)
1
Wayne National Forest (Ohio)
1
White River National Forest (Colo.)
1