Region
United States
68
Colorado
6
Utah
4
New Mexico
3
California
2
Greece
2
North America
2
Albania
1
Arizona
1
Atlantic Coast (U.S.)
1
Australia
1
Chesapeake Bay (Md. and Va.)
1
Egypt
1
Eritrea
1
Golden Gate National Recreation Area
1
Golden Gate National Recreation Area (Calif.)
1
Great Lakes (North America)
1
Great Lakes Region (North America)
1
Guam
1
Gulf Coast (U.S.)
1
Hawaii
1
Mexican-American Border Region
1
Nebraska
1
Nevada
1
New York (State)
1
Pacific Coast (U.S.)
1
Puerto Rico
1
Rome
1
Samoan Islands
1
Southwestern States
1
Virgin Islands
1
Washington (D.C.)
1
West (U.S.)
1
White Sands Missile Range
1
Wyoming
1