Cal. Gov. Code § 23156
The boundaries of Ventura County are as follows:
Commencing on the coast of the Pacific Ocean, at the mouth of the Rincon Creek; thence following up the center of said creek to its source; thence due north to the corner common to Kern, Santa Barbara, and Ventura located on the township line between T. 9 and 10 N., R. 24 W., S. B. B. & M., and running thence east with said line between T. 9 and 10 N., to the northeast corner of T. 9 N., R. 24 W., S. B. B. & M.; thence south with the range line to the quarter section corner in the west line of Sec. 7, T. 9 N., R. 23 W., S. B. B. & M.; thence east with the center line of Secs. 7, 8, 9, 10, 11, and 12 of said T. 9 N., R. 23 W., to the line between R. 22 and 23 W., of said township; thence south with the range line to the southwest corner of Sec. 18, T. 9 N., R. 22 W.; thence east to the corner of Secs. 16, 17, 20, and 21 of said township; thence south to the southwest corner of Sec. 33, of said township; thence east on the line between T. 8 and 9 N., to the west line of Sec. 2, T. 8 N., R. 20 W., S. B. B. & M.; thence south along said west line of said Sec. 2 and Sec. 11 of said township to the southwest corner of said Sec 11; thence east along the south line of said Sec. 11 and Sec. 12 of said township to and along the south line of Secs. 7, 8, 9, and 10 of T. 8 N., R. 19 W., S. B. B. & M. to the western line of Los Angeles; thence southerly along said western line of Los Angeles to the Pacific Ocean and three miles therein; thence in a northwesterly direction to a point due south of and three miles distant from the center of the mouth of Rincon Creek; thence north to the point of beginning, and including the islands of Anacapa and San Nicholas.
Ca. Gov. Code § 23156