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Region
- Madison Aquifer2
- Magothy Aquifer4
- Maine1
- MalaysiaPinang1
- Manchac, Bayou (La.)1
- Maryland9
- Maryland, Southern1
- MassachusettsCastle Island1
- Mead, Lake (Ariz. and Nev.)1
- Mesa Verde National Park (Colo.)1
- MexicoPlaya del Carmen1
- Michigan1
- Michigan, Lake1
- Middle East2
- Milledgeville (Ga.)1
- Mimas (Satellite)1
- Mississippi19
- Mississippi Embayment2
- Mississippi River3
- Mississippi River Delta (La.)1