Cal. Gov. Code § 23135
The boundaries of San Benito County are as follows:
Commencing at a point in the center of the Pajaro River, said point being the northwest corner of the Rancho las Arromitas y Agua Caliente, and being on the northern boundary line of Monterey, and running thence in a southerly direction along the southwest boundary of said rancho to the southwest corner thereof; thence southerly in a direct line to the summit of the Gabilan Range of mountains, and thence southeasterly along the summit of said Gabilan Mountains to the Chalone Peak; thence southeasterly in a direct line to the division line of the parts of the San Lorenzo Sobrantes Rancho owned respectively by Breen and Dunn; thence along said dividing line of said rancho to the southern boundary thereof; thence due south to the San Lorenzo Creek; thence southeasterly up the center of said San Lorenzo or Lewis Creek, and up the north fork thereof, to the summit of the divide between the waters of said Lewis Creek and San Benito Creek; thence following said divide southerly to the eastern boundary of Monterey and the summit of the Coast Range Mountains;
Thence northerly, following the summit of said mountains to where the range line between T. 18 S., of R. 12 and 13 E., M. D. B. & M., crosses the same; thence northerly along said range line to the northeast corner of T. 18 S., R. 12 E.; thence northerly along said township line to the south line of T. 16 N., R. 13 E., M. D. B. & M.; thence west to the southeast corner of T. 16 S., R. 12 E., M. D. B. & M.; thence northwest in a straight line to the northeast corner of T. 14 S., R. 9 E.; thence in a straight line northwesterly, running toward the northeast corner of T. 13 S., R. 7 E., to a point where said line intersects the boundary line between San Benito and Merced; thence along the boundary line between San Benito and Merced to the northeast corner of San Benito and southeast corner of Santa Clara; thence following the county line between Santa Clara and San Benito to the place of beginning.
Ca. Gov. Code § 23135