Castle Rock Regional Recreational Area

Castle Rock Regional Recreation Area is a 18000 acre regional park of the East Bay Regional Park District. It is located in Contra Costa County, in the East Bay region of northern California.

Geography
The park lies in a scenic sandstone canyon in the Diablo Foothills of the northern Diablo Range, west of Mount Diablo and Mount Diablo State Park. The closest city is Walnut Creek to the north.

Castle Rock Regional Recreation Area is bordered by: Diablo Foothills Regional Park on the west, and Shell Ridge Open Space to the north. Together, these three parks provide 18000 acre of parkland for visitors to enjoy.