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Region
- United States6
- Middle East4
- CaliforniaCentral Valley (Valley)3
- Georgia3
- Alabama2
- ArizonaNogales2
- Mexico2
- New England2
- Tennessee2
- Apalachicola River Watershed (Fla.)1
- Arizona1
- Austria1
- California1
- CaliforniaAntelope Valley1
- Chattahoochee River Watershed1
- Chile1
- Colorado1
- Colorado River (Colo.-Mexico)1
- Delaware River (N.Y.-Del. and N.J.)1
- Delaware River Watershed (N.Y.-Del. and N.J.)1