Santa Monica Mountains National Recreation Area

The Santa Monica Mountains National Recreation Area (SMMNRA) is a national recreation area containing many individual parks and open space preserves, located primarily in Southern California's Santa Monica Mountains. Located in greater Los Angeles, two thirds of SMMNRA's parklands are in northwest Los Angeles County and the remaining third, including a Simi Hills extension, is in southeastern Ventura County.

Source: Wikipedia — Santa Monica Mountains National Recreation Area (CC BY-SA 4.0)