The Santa Rosa Valley is a small valley and rural community in Ventura County, California. It is about 5 miles long (east to west) and 2 miles wide (north to south). This community is sometimes considered to an outlying neighborhood of Camarillo, although it is not within its territorial limits. It is bordered on the south by Wildwood Park and on the north by Las Posas Hills. The valley is drained principally by the Arroyo Santa Rosa, a tributary of Calleguas Creek, which flows into the Pacific Ocean at Mugu Lagoon.
Information source: Wikipedia