Cal. Gov. Code § 23110
The boundaries of Fresno County are as follows:
Beginning on the south line of Merced at a point where said line crosses the San Joaquin River; thence south, 45 degrees west, and on the line of Merced, to the centerline of a drain in the Southwest Quarter of the Southwest Quarter of Section 6, T. 11 S., R. 13 E., M.D.B.& M; thence along said centerline southeasterly to the centerline of Colony East Ditch Canal; thence southerly along said centerline to the south line of the north half of the Southeast Quarter of Section 7, said Township and Range; thence westerly along said south line to the northeast corner of the west half of the Southwest Quarter of the Southeast Quarter of said section; thence southerly along the east line of said west half to the south line of said Section; thence westerly along said line to the North Quarter corner of Section 18, said Township and Range; thence southerly along the north-south centerline of Section 18 and Section 19 to the south line of Section 19; thence westerly along said south line and the south line of Sections 24 & 23 & 22 & 21 in T. 11 S., R. 12 E. to a point that is south 45 degrees west from said line of Merced; thence south 45 degrees west to the eastern boundary line of San Benito; thence southeasterly along said boundary line to the southeast corner of T. 16 S. R. 12 E.; thence easterly along the south line of T. 16 S. to the northeast corner of T. 17 S., R. 12 east; thence southerly along the east line of R. 12 E. to the point where the summit line of the Coast Range Mountains crosses the east line of R. 12 east and continuing along said San Benito boundary along the summit line to Monterey; thence continuing along the Monterey boundary and said summit line in a southerly and southeasterly direction, to a point in that boundary, which point is south 45 degrees west from the point on Kings River where the northern line of T. 16 S. crosses the Kings River; said point being the common corner of Fresno, Monterey, and Kings; said corner point defined by survey recorded in Book 42 of Record of Surveys at Pages 57 and 58, Fresno County Records; thence along the Fresno-Kings boundary, as defined by said survey north 47o 12' 09" east, to the northwest corner of Section 19, T. 20 S., R. 19 E.; thence north along the west line of R. 19 E. to the north line of T. 18 S.; thence east along the north line of T. 18 S. to the centerline of Kings River; thence easterly along the centerline of Kings River to the point that intersects the south 45 degrees west boundary, said boundary is south 45 degrees west from the point on Kings River where the northern line of T. 16 S. crosses the Kings River; thence north 45 degrees east to the point on the Kings River where the northern line of T. 16 S. crosses the Kings River; thence east along the northern line of T. 16 S. and continuing on said line to the northwest corner of T. 16 S., R. 25 E.; thence north to the northwest corner of T. 15 S., R. 25 E.; thence east to the northeast corner of T. 15 S., R. 27 E.; thence north to the northeast corner of T. 14 S. of R. 27 E.; thence east on the line between T. 13 and 14 S. to the summit of the Sierra Nevada Mountains, being the western line of Inyo; thence northwesterly, on the summit line and lines of Inyo and Mono, to the common corner of Mono, Madera, and Fresno; thence southwesterly along the boundary of Madera to the point where the San Joaquin River crosses the south boundary line of T. 6 S., R. 24 E.; thence southwesterly and northwesterly following the meanderings of said river to a point on the southerly boundary of Merced, said point being the common corner of Fresno, Madera, and Merced and the place of beginning.
Ca. Gov. Code § 23110