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Region
- Mars (Planet)32
- Venus (Planet)20
- Louisiana16
- Appalachian Basin13
- United States13
- TexasHouston Region12
- Florida11
- Floridan Aquifer10
- Harris-Galveston Coastal Subsidence District (Tex.)10
- High Plains Aquifer10
- Colorado9
- MissouriShannon County9
- Washington (State)Clark County9
- ArizonaCoconino County8
- ArizonaMohave County8
- Edwards Aquifer (Tex.)8
- CaliforniaSan Bernardino County7
- Pacific Coast (Calif.)7
- Washington (State)Cowlitz County7
- Afghanistan6