S.C. Code § 4-3-260
Florence County is bounded as follows: by a line beginning at Sanders' Bridge on Lynch's River running in an air line to a point where the Cheraw and Darlington Railroad crosses High Hill Creek; thence down High Hill Creek to its confluence with Black Creek; thence up Black Creek to Muse's Bridge; thence following the direction of a straight line running from Muse's Bridge to Cashua's Ferry to Back Swamp; thence down Back Swamp to Herring Creek; thence down said creek to its confluence with the Great Pee Dee River; thence following the Great Pee Dee River down to its intersection with Lynch's River; thence following said river up to a point and above Anderson's Bridge; thence in a straight line westward to the Williamsburg and Clarendon County line so as to embrace twenty-eight square miles of the territory of Williamsburg County; thence following said Clarendon and Williamsburg County line in a southwesterly direction to its intersection with what is known as the Centennial Road; thence following said Centennial Road in a westerly direction to Hudson's Mill; thence running in a northerly direction to a point on the Clarendon and Sumter County line at Wood's Mill; thence following the Clarendon and Sumter County line in a northeast direction to Lynch's River; thence following said river up to Sanders' Bridge to the beginning corner. Florence County also embraces the following described sections cut off from Williamsburg County and incorporated within the county of Florence, as follows, to wit: all that portion of Lee and Lake townships as appears from plat made by E. J. Smith, surveyor, dated November 28 1903, beginning at a point one mile south of Anderson's Bridge on Lynch's River and then running in a westerly direction through portions of Lee and Lake townships in said county of Williamsburg to the line separating the county of Williamsburg from Mott's township in the county of Florence and also that portion of Williamsburg County annexed to Florence County pursuant to an act of the General Assembly of South Carolina, approved February 16 1912, and appearing as act No. 456, at page 817 of the acts of 1912, vol. 27 of the statutes at large, and described as follows: commencing at a point where the center of Lynch's Lake Swamp intersects the present Florence County line and following said Florence County line N. 16° 45' E. 26,000 feet to Cathold Landing and following in an easterly direction the run of the branch crossing Lynch's River and down the middle of said run to the point where the middle of Lynch's Lake Swamp intersects the middle of the run of Lynch's River; and thence up said middle of Lynch's Lake Swamp to point of beginning according to map made in February 1911 by R. M. Cantey and Joseph Palmer, surveyors, and filed in the office of the clerk of court for Florence County and in addition the following territory containing 45.3 square miles, transferred from Williamsburg County by act of the General Assembly approved March 4 1921, to wit: beginning at a point in the road leading to Lee's Cross Roads where the same crosses Lynch's Creek and running S. 12° 30' W. 1,943 feet; thence S. 8° 10' W. 526 feet; thence S. 14° 30' E. 1,119 feet; thence S. 25° 20' E. 730 feet; thence S. 72° 20' E. 43,610 feet to a stake at the road leading from Indian Town in Kingstree; thence N. 26° E. 316 feet; thence along the Kingstree road N. 71° 35' E. 10,094 feet; thence 504 feet along said road to the intersection of Owen's Swamp; thence 527 feet along said road; thence 806 feet along said road; thence northeast 711 feet; thence northeast 559 feet; thence E. 506 feet; thence southeast 1,225 feet to a point in the center of said road; thence northeast 3,380 feet along center of said road; thence 2,315 feet to where it intersects Flanagan's Creek; thence along Muddy Creek to the intersection of Clark's Creek; thence along Clark's Creek to the intersection of Pee Dee River; thence along Pee Dee River to the mouth of Lynch's River; thence along Lynch's River to the mouth of Lynch's Lake; thence along Lynch's Lake to the beginning point.
S.C. Code § 4-3-260