Cal. Gov. Code § 23118
The boundaries of Lassen County are as follows:
Beginning at the southwest corner, on the northern line of Sierra, located on the south boundary of T. 22 N., R. 16 E., M. D. B. & M., at the corner common to Secs. 35 and 36, and running thence north two miles to the corner common to Secs. 23, 24, and 26, said township and range; thence east one mile to the east boundary of said township and range at the corner common to Secs. 24 and 25; thence north one mile to the west corner of Secs. 18 and 19, T. 22 N., R. 17 E., M. D. B. & M.; thence east one-half mile to the quarter section corner between said Secs. 18 and 19; thence north one mile to the quarter section corner between Secs. 7 and 18, said township and range; thence east one-half mile to the corner common to Secs. 7, 8, 17, and 18, said township and range; thence north on the section lines to the south corner of Secs. 31 and 32, T. 23 N., R. 17 E., M. D. B. & M.; thence north six miles to the south corner of Secs. 31 and 32, T. 24 N., R. 17 E., M. D. B. & M.; thence east one-half mile; thence north two miles; thence west one-half mile; thence north two miles;
Thence west one mile, to the east corner of Secs. 12 and 13, T. 24 N., R. 16 E., M. D. B. & M.; thence north one-half mile to the quarter section corner on the east side of said Sec. 12; thence west one-half mile to the center of said Sec. 12; thence north one-half mile to the quarter section corner between Secs. 1 and 12, said township and range; thence west one-half mile to the corner common to Secs. 1, 2, 11, and 12, said township and range; thence north one-half mile to the quarter section corner between said Secs. 1 and 2; thence west one-half mile to the center of said Sec. 2; thence north one-half mile to the quarter section corner on north boundary of said Sec. 2; thence west on the township line one-half mile to the south corner of Secs. 34 and 35, T. 25 N., R. 16 E., M. D. B. & M.; thence north one mile to the corner common to Secs. 26, 27, 34, and 35, said township and range; thence west one-half mile to the quarter section corner between said Secs. 27 and 34; thence north one mile to the quarter section corner between Secs. 22 and 27, said township and range; thence west one-half mile to the corner common to Secs. 21, 22, 27, and 28, said township and range; thence north one mile to the corner common to Secs. 15, 16, 21, 22, said township and range; thence west one mile to the corner common to Secs. 16, 17, 20, and 21, said township and range;
Thence north two miles to the corner common to Secs. 4, 5, 8, and 9, said township and range; thence west one-half mile to the quarter section corner between said Secs. 5 and 8; thence north three miles to the corner common to Secs. 19, 20, 29, and 30, said township and range; thence west two miles to the corner common to Secs. 23, 24, 25, and 26, T. 26 N., R. 15 E., M. D. B. & M.; thence north one and one-half miles to the quarter section corner between Secs. 13 and 14, said township and range; thence west one mile to the quarter section corner between Secs. 14 and 15, said township and range; thence north one-half mile to the corner common to Secs. 10, 11, 14, and 15, said township and range; thence west four miles to the west corner of Secs. 7 and 18, said township and range; thence north, on the township line, one-half mile to the quarter section corner, on the east boundary of Sec. 12, T. 26 N., R. 14 E., M. D. B. & M.; thence west one mile to the quarter section corner between Secs. 11 and 12, said township and range; thence north one-half mile to the corner common to Secs. 1, 2, 11, and 12, said township and range; thence west one mile to the corner common to Secs. 2, 3, 10, and 11, said township and range; thence north three-quarters of a mile to the southwest corner of lot five in Sec. 2 and the southeast corner of lot seven in Sec. 3, said township and range; thence west one mile to the southwest corner of lot five in Sec. 3 and the southeast corner of lot seven in Sec. 4, said township and range;
Thence north one-half mile to the north corner of Secs. 3 and 4, said township and range; thence west on the township line one-half mile to the quarter section corner on the south boundary of Sec. 33, T. 27 N., R. 14 E., M. D. B. & M.; thence north one mile to the quarter section corner between Secs. 28 and 33, said township and range; thence west one-half mile to the corner common to Secs. 28, 29, 32, and 33, said township and range; thence north one-half mile to the quarter section corner between said Secs. 28 and 29; thence west one mile to the quarter section corner between Secs. 29 and 30, said township and range; thence north one-half mile to the corner common to Secs. 19, 20, 29, and 30, said township and range; thence west one-half mile to the quarter section corner between said Secs. 19 and 30; thence north one mile to the quarter section corner between Secs. 18 and 19, said township and range; thence west one-half mile to the west corner of said Secs. 18 and 19; thence north on the township line one mile to the east corner of Secs. 12 and 13, T. 27 N., R. 13 E., M. D. B. & M.; thence west one and one-half miles to the quarter section corner between Secs. 11 and 14, said township and range; thence north one mile to the quarter section corner between Secs. 2 and 11, said township and range;
Thence west one-half mile to the corner common to Secs. 2, 3, 10, and 11, said township and range; thence north one mile to the north corner of said Secs. 2 and 3; thence west on the township line one mile to the south corner of Secs. 23 and 34, T. 28 N., R. 13 E., M. D. B. & M.; thence north one mile to the corner common to Secs. 27, 28, 33, and 34, said township and range; thence west one mile to the corner common to Secs. 28, 29, 32, and 33, said township and range; thence north one-half mile to the quarter section corner between said Secs. 28 and 29; thence west one mile to the quarter section corner between Secs. 29 and 30, said township and range; thence north one-half mile; thence west one and one-half miles to the quarter section corner between Secs. 24 and 25, T. 28 N., R. 12 E.; thence north one and one-half miles to the center of Sec. 13, said township and range; thence west two and one-half miles to the quarter section corner between Secs. 15 and 16, said township and range; thence north one-half mile to the corner common to Secs. 9, 10, 15, and 16, said township and range; thence west one mile to the corner common to Secs. 8, 9, 16, and 17, said township and range; thence north one-half mile to the quarter section corner between said Secs. 8 and 9; thence west one-half mile to the center of said Sec. 8; thence north one-half mile to the quarter section corner between Secs. 5 and 8, said township and range; thence west four miles to the quarter section corner between Secs. 3 and 10, T. 28 N., R. 11 E., M. D. B. & M.; thence north one-half mile to the center of said Sec. 3; thence west two miles to the center of Sec. 5, said township and range; thence south one-half mile to the quarter section corner between Secs. 5 and 8, said township and range;
Thence west one-half mile to the corner common to Secs. 5, 6, 7, and 8, said township and range; thence south one-half mile to the quarter section corner between said Secs. 7 and 8; thence west one mile, more or less, to the quarter section corner on the west boundary of said Sec. 7; thence south on the township line to the east corner of Secs. 13 and 24, T. 28 N., R. 10 E., M. D. B. & M.; thence west one mile to the corner common to Secs. 13, 14, 23, and 24, said township and range; thence south one-half mile to the quarter section corner between said Secs. 23 and 24; thence west one mile to the quarter section corner between Secs. 22 and 23, said township and range; thence south one mile to the quarter section corner between Secs. 26 and 27, said township and range; thence west one-half mile to the center of said Sec. 27; thence south one-half mile to the quarter section corner between Secs. 27 and 34, said township and range; thence west one-half mile to the corner common to Secs. 27, 28, 33, and 34, said township and range; thence south one-half mile to the quarter section corner between said Secs. 33 and 34; thence west one mile to the quarter section corner between Secs. 32 and 33, said township and range; thence south three miles to the quarter section corner between Secs. 16 and 17, T. 27 N., R. 10 E., M. D. B. & M.; thence west one mile to the quarter section corner between Secs. 17 and 18, said township and range; thence south one-half mile to the corner common to Secs. 17, 18, 19, and 20, said township and range;
Thence west two miles to the corner common to Secs. 13, 14, 23, and 24, T. 27 N., R. 9 E., M. D. B. & M.; thence north one mile to the corner common to Secs. 11, 12, 13, and 14, said township and range; thence west one mile to the corner common to Secs. 10, 11, 14, and 15, said township and range; thence north one mile to the corner common to Secs. 2, 3, 10, and 11, said township and range; thence west three miles to the corner common to Secs. 5, 6, 7, and 8, said township and range; thence north one mile to the section corner common to Secs. 31 and 32, T. 28 N., R. 9 E.; thence west on township line two miles to the south corner of Secs. 35 and 36, T. 28 N., R. 8 E., M. D. B. & M.; thence north one and one-half miles to the quarter section corner between Secs. 25 and 26, said township and range; thence west one mile to the quarter section corner between Secs. 26 and 27, said township and range; thence north 13 miles, more or less, to the quarter section corner between Secs. 22 and 23, T. 30 N., R. 8 E., M. D. B. & M.; thence west 14 miles, more or less, to the corner common to Shasta, Lassen and Plumas, said corner being the southeast corner of Shasta and situated in the west half of Sec. 21, T. 31 N., R. 6 E., M. D. B. & M.; thence north on the eastern line of Shasta to the southern line of Modoc marked by a rock mound, being the northwest corner of Lassen and the northeast corner of Shasta; thence east, along said line, to the eastern boundary of the State; thence south, along said state line, to the northeast corner of Sierra; thence west, along the line of Sierra, to the place of beginning.
Ca. Gov. Code § 23118