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Region
- Mars (Planet)14
- Ganymede (Satellite)4
- Edwards Aquifer (Tex.)3
- Washington (State)Skamania County3
- IdahoLemhi County2
- Io (Satellite)2
- Kasei Valles (Mars)2
- NevadaClark County2
- TexasEdwards Aquifer2
- Trinity Aquifer (Tex.)2
- Washington (State)Lewis County2
- Alaska1
- AlaskaArctic National Wildlife Refuge1
- AlaskaBig Delta1
- AlaskaBrooks Range1
- AlaskaGoodpaster River Watershed1
- AlaskaNorth Slope Borough1
- AlaskaPhilip Smith Mountains1
- Appalachian Basin1
- Arctic regions1