Region
Colorado River (Colo.-Mexico)
6
West (U.S.)
Grand Canyon (Ariz.)
4
United States
3
Arizona
1
Colorado
1
Colorado (Col.-Mexique : Fleuve)
1
Colorado River Watershed (Colo.-Mexico)
1
Etats-Unis (Ouest)
1
Glen Canyon Dam (Ariz.)
1
Glen Canyon Region (Utah and Ariz.)
1
Green River (Utah)
1
Utah
1
Wyoming
1