Cal. Gov. Code § 23127
The boundaries of Monterey County are as follows:
Beginning in the Pacific Ocean, at the southwest corner of Santa Cruz; thence east to the mouth of Pajaro River, on the Bay of Monterey; thence up said stream to a point in its center, said point being the northwest corner of the Rancho las Arromitas y Agua Caliente, and also the northwest corner of San Benito, 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 northwest corner of the Rancho las Vergelos; 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 owned respectively by Breen and Dunn; thence along said dividing line of said rancho to the southern boundary thereof; thence due south of the San Lorenzo Creek; thence southeasterly up 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 summit of the Coast Range of mountains, this being the common corner of Monterey, San Benito, and Fresno; thence southeasterly along the summit of the Coast Range to the sixth standard south, Mount Diablo base, being the common corner of San Luis Obispo, Kern, Tulare, and Monterey; thence following the northern boundary of San Luis Obispo, on said standard line and extension thereof, to the Pacific Ocean; thence along the shore northerly to the place of beginning.
Ca. Gov. Code § 23127