Region
Arizona
4
Florida
3
Long Island Sound (N.Y. and Conn.)
2
New England
2
Northeastern States
2
Alabama
1
Arbuckle-Simpson Aquifer
1
Arbuckle-Simpson Aquifer (Okla.)
1
Argentina
1
British Columbia
1
Cheraw Fault
1
Chesapeake Bay (Md. and Va.)
1
Chickasaw National Recreation Area
1
Chickasaw National Recreation Area (Okla.)
1
Colorado
1
Earth (Planet)
1
Erie, Lake, Region
1
France
1
Grand Canyon
1
Great Britain
1
Gulf Region
1
Illinois
1
India
1
Lees Ferry
1
Mars (Planet)
1
Middle Atlantic States
1
Mississippi
1
Nebraska
1
New Brunswick
1
New Mexico
1
North Carolina
1
Nova Scotia
1
Oklahoma
1
Ontario
1
Puerto Rico
1
Puget Sound Region
1
Périgord
1
Périgord (France)
1
Québec (Province)
1
Superior, Lake, Region
1
Tennessee, West
1
Texas
1
United States
1
Washington (State)
1