Region
Arizona
36
United States
30
Grand Canyon
23
Sequoia National Park (Calif.)
20
California
19
Kings Canyon National Park (Calif.)
19
Colorado River (Colo.-Mexico)
18
Glacier National Park (Mont.)
16
North America
16
Alaska
15
Colorado River
13
Yellowstone National Park
13
Montana
12
Colorado
11
Glacier National Park
11
New Mexico
11
North Carolina
10
Shenandoah National Park (Va.)
10
Hawaii Volcanoes National Park (Hawaii)
9
Michigan
9
Mohave County
9
Pictured Rocks National Lakeshore (Mich.)
9
Sequoia National Park
9
Zion National Park (Utah)
9
Coconino County
8
Grand Canyon National Park (Ariz.)
8
Hawaii
8
Kings Canyon National Park
8
Mount Rainier National Park (Wash.)
8
Utah
8
Washington (State)
8
Wyoming
8
Dinosaur National Monument (Colo. and Utah)
7
Glacier Bay National Park and Preserve (Alaska)
7
Great Smoky Mountains National Park (N.C. and Tenn.)
7
Kilauea Volcano (Hawaii)
7
Kluane National Park and Reserve (Yukon)
7
Texas
7
Virginia
7
Wrangell-Saint Elias National Park and Preserve (Alaska)
7
Colonial National Historical Park (Va.)
6
Lava Beds National Monument (Calif.)
6
Pictured Rocks National Lakeshore
6
Badlands National Park (S.D.)
5
Crater Lake National Park
5
Glen Canyon National Recreation Area (Utah and Ariz.)
5
Grand Canyon (Ariz.)
5
Grand Canyon National Park
5
Great Sand Dunes National Park and Preserve
5
Nevada
5
more ...