Region
Washington (State)
15
California
12
Alaska
9
Arizona
8
Colorado
6
Hawaii
6
Indiana
6
Indiana Dunes National Park
6
Michigan
5
Nevada
5
Pennsylvania
5
Arkansas
4
Great Sand Dunes National Park and Preserve (Colo.)
4
Maine
4
Saint Croix National Scenic Riverway (Wis. and Minn.)
4
Virginia
4
Yosemite National Park
4
Death Valley (Calif. and Nev.)
3
Florida
3
Indiana Dunes National Park (Ind.)
3
Lake Mead National Recreation Area (Ariz. and Nev.)
3
New Mexico
3
West Virginia
3
Wrangell-Saint Elias National Park and Preserve
3
Yellowstone National Park
3
Acadia National Park (Me.)
2
Bass Harbor (Me.)
2
Catoctin Mountain Park
2
Cuyahoga River
2
Cuyahoga Valley National Park
2
Death Valley National Park (Calif. and Nev.)
2
Elwha River
2
Georgia
2
Glen Canyon National Recreation Area (Utah and Ariz.)
2
Grapevine Canyon (Calif. and Nev.)
2
Great Basin National Park
2
Hot Springs
2
Hot Springs National Park (Hot Springs, Ark.)
2
Isle Royale
2
Kaloko-Honokohau National Historical Park
2
Maryland
2
Massachusetts
2
Montana
2
Montezuma Well (Yavapai County, Ariz.)
2
Mount Rainier National Park
2
New River Gorge National Park and Preserve (W. Va.)
2
North Dakota
2
Ohio
2
Oklahoma
2
Olympic Mountains
2
more ...