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Region
- United States32
- Mars (Planet)18
- India17
- Black Hills (S.D. and Wyo.)12
- Iraq8
- Afghanistan7
- Pakistan5
- Saturn (Planet)5
- Ganymede (Satellite)4
- Hellas Planitia (Mars)4
- Iran4
- Latin America4
- New England4
- Africa3
- Developing countries3
- Edwards Aquifer (Tex.)3
- Pacific Area3
- Pacific Ocean3
- Washington (State)Skamania County3
- Africa, Northwest2