Miss. Code Ann. § 19-1-21

Claiborne County is bounded by beginning at the junction of the Little Boguesha with the Mississippi River, nearly opposite to Big Black Island, on the southwestern boundary of Warren County; thence with Little Boguesha to the Big Boguesha; thence with Big Boguesha to the Big Black River; thence up said river, with its meanderings, to the old Choctaw boundary, in township fourteen, range five, east; thence south with said Choctaw boundary line to the township line between townships nine and ten, the same being the northeast corner of Jefferson County; and the boundary line between Claiborne and Jefferson Counties is as follows: beginning on the Mississippi River at a point opposite the lower end of the Petit Gulf hills, running thence a direct course to the most northern point of the tract of land formerly known as “Robert Trimble's,” on Tabor's creek of Bayou Pierre; continuing the same course until it shall intersect the South Fork of Bayou Pierre, at Elijah L. Clarke's wagon ford on said creek; thence up said creek to the township line between townships nine and ten; thence along said township line east to the old Choctaw boundary line; and the western boundary line of Claiborne County is the western boundary of the state between said two points of beginning on the Mississippi River. The county site is Port Gibson.