Castle Rock Regional Recreational Area

Castle Rock Regional Recreation Area
(Castle Rock Park)
LocationContra Costa County, California
Nearest cityWalnut Creek
Coordinates37°53′6″N 121°59′29″W / 37.88500°N 121.99139°W / 37.88500; -121.99139
Area18,000 acres (73 km2)
Governing bodyEast 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.