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Region
- Abbeville County (S.C.)1
- Accomack County (Va.)1
- Acidalia Planitia (Mars)8
- Africa1
- Africa, North1
- AlaskaBethel Region1
- AlaskaFish Creek Region (North Slope Borough)1
- America2
- Antarctica1
- Appalachian Region4
- ArizonaPima County3
- ArkansasHarrison Region2
- Arsia Mons (Mars)7
- Atlanta (Ga.)3
- Atlantic Coast (South America)1
- Atlantic Coast (U.S.)2
- Atlantic Ocean2
- Balkan Peninsula1
- Baton Rouge Region (La.)1
- Blackleaf Formation (Mont.)1