Region
Colorado River (Colo.-Mexico)
373
Arizona
76
Colorado
50
Colorado River Watershed (Colo.-Mexico)
37
Grand Canyon (Ariz.)
36
United States
32
Grand Canyon
31
Colorado River Valley (Colo.-Mexico)
18
West (U.S.)
18
Southwest, New
15
Glen Canyon Dam (Ariz.)
14
California
12
Grand Canyon National Park
10
Hoover Dam (Ariz. and Nev.)
10
Gunnison River
5
Mexico
5
Rio Grande (Colo.-Mexico and Tex.)
5
Utah
5
Grand Canyon National Park (Ariz.)
4
Green River (Wyo.-Utah)
4
Nevada
4
Colorado River Region (Colo.-Mexico)
3
Glen Canyon (Utah and Ariz.)
3
Glen Canyon Dam
3
Glen Canyon National Recreation Area (Utah and Ariz.)
3
Grand Valley (Colo. and Utah)
3
Mesa County
3
Tijuana River (Mexico and Calif.)
3
Wyoming
3
California, Gulf of (Mexico)
2
California, Southern
2
Colorado Plateau
2
Grand Junction
2
Grand Junction Region
2
Missouri River
2
Palisade
2
Rocky Mountains
2
Salton Sea
2
San Juan River Watershed (Colo.-Utah)
2
Southwestern States
2
Yuma Region
2
Alaska
1
Amazon River Region
1
Arkansas River
1
Big Thompson River
1
Big Thompson River (Colo.)
1
Boulder City
1
Boulder City (Nev.)
1
Burnet County
1
Coconino County
1
more ...