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Region
- Arkansas5
- Black Creek Aquifer (S.C. and N.C.)2
- Delaware3
- Fort Peck Indian Reservation (Mont.)1
- High Plains (U.S.)1
- High Plains Aquifer2
- IdahoAmerican Falls Reservoir1
- LouisianaBarataria Bay Watershed1
- LouisianaMermentau River Watershed1
- Mississippi3
- Mississippi River Watershed1
- MississippiDelta (Region)1
- MontanaBig Horn County3
- MontanaDaniels County1
- MontanaFort Peck Indian Reservation3
- MontanaLame Deer Creek1
- MontanaNorthern Cheyenne Indian Reservation4
- MontanaPorcupine Creek (Valley County)1
- MontanaRosebud County1
- MontanaRosebud Creek1