Castle Rock Regional Recreational Area
| Castle Rock Regional Recreation Area (Castle Rock Park) | |
|---|---|
| Location | Contra Costa County, California |
| Nearest city | Walnut Creek |
| Coordinates | 37°53′6″N 121°59′29″W / 37.88500°N 121.99139°W |
| Area | 18,000 acres (73 km2) |
| Governing body | East Bay Regional Park District |
Castle Rock Regional Recreation Area is a 18,000 acres (73 km2) regional park of the East Bay Regional Park District. It is located in Contra Costa County, in the East Bay region of northern California.