California Code, Government Code - GOV § 23108

The boundaries of Del Norte County are as follows:

Situated in the northwest corner of the State of California, beginning at a point in the Pacific Ocean, on the forty-second parallel of north latitude, three miles from shore, being on the southern line of Oregon;  thence running southerly, three miles from ocean shore, to the northern line of Humboldt County;  thence easterly, along the northern boundary of Humboldt to the summit of a spur of the Siskiyou range of mountains;  thence northerly, following the summit of said spur of the Siskiyou range of mountains, to the forty-second parallel of north latitude;  thence due west to the place of beginning.