Region
Alaska
53
United States
18
West Chichagof-Yakobi Wilderness
18
Colorado
17
Florida
10
New York (State)
9
Utah
6
California
5
El Paso County
5
New Mexico
5
Arizona
4
Arkansas
3
High Plains Aquifer
3
Mississippi
3
New Jersey
3
North America
3
Oneida County
3
Park County
3
Santa Fe Group
3
Summit County
3
West (U.S.)
3
Buffalo Bayou Watershed
2
California, Southern
2
Floridan Aquifer
2
Glacier Bay
2
Glacier Bay (Alaska)
2
Hawthorn Formation
2
Idaho
2
Kansas
2
La Plata County
2
Mars (Planet)
2
Massachusetts
2
Montana
2
Oregon
2
Puerto Rico
2
Rancocas Creek Watershed
2
Rio Grande Valley (Colo.-Mexico and Tex.)
2
Salt Lake County
2
Texas
2
Washington (State)
2
Wyoming
2
Africa
1
Albuquerque Region
1
Ambrosia Lake
1
Anchorage Region
1
Aquia Formation
1
Atqasuk Region (Alaska)
1
Beaver River Watershed (Utah)
1
Biscayne Aquifer
1
Blying Sound Region
1
more ...