Region
- West (U.S.) 138 results
- United States 115 results
- Colorado 50 results
- China 7 results
- Southwest, New 5 results
- Australia 4 results
- California 4 results
- Colorado River (Colo.-Mexico) 4 results
- Colorado River Watershed (Colo.-Mexico) 4 results
- Developing countries 4 results
- Arizona 3 results
- South Platte River Watershed (Colo. and Neb.) 3 results
- Virginia 3 results
- West United States 3 results
- West Virginia 3 results
- Carson River (Nev.) 2 results
- Deschutes River (Or.) 2 results
- Great Basin 2 results
- Oregon 2 results
- Truckee River (Calif. and Nev.) 2 results
- Arctic Regions 1 results
- Bahamas 1 results
- Belize 1 results
- British Virgin Islands 1 results
- Costa Rica 1 results
- Dominican Republic 1 results
- Green River Formation 1 results
- Grenada 1 results
- Guam 1 results
- Israel 1 results
- Jamaica 1 results
- Marshall Islands 1 results
- Micronesia (Federated States) 1 results
- New Mexico 1 results
- Northern Mariana Islands 1 results
- Palau 1 results
- Papua New Guinea 1 results
- Puerto Rico 1 results
- Saint Vincent and the Grenadines 1 results
- Solomon Islands 1 results
- Uinta Basin (Utah and Colo.) 1 results
- United States Virgin Islands 1 results