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Region
- Mars (Planet)60
- Afghanistan38
- Venus (Planet)24
- ArizonaMohave County23
- Georgia17
- NevadaLincoln County14
- Powder River Basin (Wyo. and Mont.)13
- Washington (State)Clark County13
- ArizonaCoconino County12
- MissouriShannon County12
- NevadaNye County12
- Appalachian Basin11
- Guiana Highlands10
- Alaska9
- ArizonaCochise County9
- Ganymede (Satellite)9
- Washington (State)Cowlitz County9
- WyomingAlbany County9
- Edwards Aquifer (Tex.)8
- Kansas8