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Region
- Caddo Parish (La.)1
- California8
- California, Northern3
- California, Southern5
- CaliforniaAntelope Valley1
- CaliforniaBonsall Region1
- CaliforniaCoachella Valley1
- CaliforniaLos Angeles Region1
- CaliforniaMojave River Watershed1
- CaliforniaSan Bernardino County1
- CaliforniaSan Diego County1
- CaliforniaSan Francisco Bay Area1
- CaliforniaSan Luis Rey River Valley1
- CaliforniaSanta Barbara County1
- CaliforniaShasta County1
- CaliforniaTehama County1
- Charles River (Mass.)1
- Chesapeake Bay Region (Md. and Va.)6
- Coachella Valley (Calif.)1
- Coeur d'Alene Lake (Idaho)1