Arthur B. Ripley Desert Woodland State Park is a state park in the western Antelope Valley in Southern California. The park protects mature stands of Joshua trees and California juniper trees in their western Mojave Desert habitat.
The park is located in northern Los Angeles County, 20 miles west of downtown Lancaster and about 5 miles from the Antelope Valley California Poppy Reserve.
Wikipedia https://en.wikipedia.org/wiki/Arthur_B._Ripley_Desert_Woodland_State_Park
More information http://www.parks.ca.gov/?page_id=634
Coordinates 34°44'55.087" N -118°29'44.97" E