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Region
- Mars (Planet)227
- Georgia166
- Afghanistan147
- Louisiana42
- Mississippi40
- United States40
- CaliforniaSan Diego County38
- Florida36
- Floridan Aquifer32
- Montana32
- California31
- Venus (Planet)31
- Arkansas28
- ArizonaMohave County26
- CaliforniaSan Bernardino County26
- Appalachian Basin24
- High Plains Aquifer24
- Colorado23
- Texas23
- Alabama21