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Region
- Mars (Planet)42
- Afghanistan32
- United States6
- Georgia3
- Mississippi3
- Appalachian Basin2
- Arkansas2
- Floridan Aquifer2
- Illinois2
- Illinois Basin2
- Michigan Basin (Mich. and Ont.)2
- TexasBuffalo Bayou Watershed2
- Accomack County (Va.)1
- Alabama1
- Bog Hot Valley (Nev.)1
- Bolivia1
- British Columbia1
- CaliforniaHayward Fault1
- Death Valley Region (Calif. and Nev.)1
- Ecuador1