title: Castle Rock Regional Recreational Area
text: # Castle Rock Regional Recreational Area
  
  Castle Rock Regional Recreation Area is a 18,000 acres (73 $km^2)$ 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 18,000 acres (73 $km^2)$ of parkland for visitors to enjoy.
  
  