Region
Colorado River (Colo.-Mexico)
177
Arizona
54
United States
25
Grand Canyon (Ariz.)
23
North America
23
Colorado River
21
California
20
Hoover Dam (Ariz. and Nev.)
19
West (U.S.)
18
Grand Canyon
15
Southwest, New
13
Colorado River Watershed (Colo.-Mexico)
12
Glen Canyon Dam (Ariz.)
12
Colorado River Valley (Colo.-Mexico)
8
Colorado
7
Rio Grande (Colo.-Mexico and Tex.)
7
Grand Canyon National Park
5
Nevada
5
Glen Canyon (Utah and Ariz.)
4
Glen Canyon Dam
4
Mexico
4
United States, West
4
Colorado River Delta (Mexico)
3
Four Corners Region
3
Tijuana River (Mexico and Calif.)
3
Boulder City
2
Boulder City (Nev.)
2
California, Southern
2
Great Basin
2
Green River (Wyo.-Utah)
2
Marble Canyon (Coconino County : Canyon)
2
Southern California
2
Yuma Region
2
Alaska
1
Allegheny National Wild and Scenic River (Pa.)
1
Big Thompson River (Colo.)
1
Colorado Plateau
1
Colorado River (Tex.)
1
Colorado River Region (Colo.-Mexico)
1
Colorado River Valley
1
Colorado River Watershed
1
Columbia River Watershed
1
Dinosaur National Monument (Colo. and Utah)
1
Echo Park Dam (Colo.)
1
Glen Canyon
1
Grand Canyon National Park (Ariz.)
1
Grand Junction
1
Grand canyon (Ariz.)
1
Green River Watershed (Wyo.-Utah)
1
Gunnison River
1
more ...