S.C. Code § 4-3-30
Allendale County is bounded as follows: beginning at a point in the Savannah River on the South Carolina and Georgia boundary line opposite Steel Landing and running in a northerly direction to a stake at Steel Landing; thence a straight line N. 43° E. about 6.12 miles to a stake at or near the intersection of the Barnwell-Robbins public road with a road leading to Millett; thence S. 73° E. about 5.23 miles to a stake at or near Stinson's Bridge on Lower Three Runs; thence S. 70° E. about 5.50 miles at a stake at or near Goodson's Mill site; thence E. about 4.72 miles to a stake on Well Branch; thence down the run of Well Branch to the Salkehatchie River; thence down the Salkehatchie River to its intersection with the Bamberg-Colleton County line; thence southwesterly along a continuation of said Bamberg-Colleton County line to its intersection with the eastern edge of the right of way of the Seaboard Air Line Railway; thence in a southerly direction along said eastern edge of said railway right of way to a stake eight miles and 200 feet from the Hampton County courthouse; thence in a westerly direction to the confluence of Beach Branch with the Coosawhatchie River; thence up the run of said Beach Branch to its intersection with the eastern edge of the right of way of the Southern Railway Company; thence southerly along said eastern edge of said right of way 3.78 miles to a stake; thence S. 49 1/2 ° W. 1.68 miles to the junction of the Hudson Ferry Road and the Sisters Ferry Road; thence southerly along the south side of the said Hudson Ferry Road to a stake about one-half mile above Long Creek Bridge; thence in a straight line S. 71° W. about 1.75 miles to a stake on the east side of the River Road about one-fourth mile north of Long Creek Bridge on said River Road; thence in a straight line S. 55° W. 10104 feet to a stake between an ironwood tree and a small branch; thence west 3306 feet to a stake on the east side of the Savannah River; thence continuing west to a point in the Savannah River on the South Carolina-Georgia State line; thence northerly along said South Carolina-Georgia State line to the point of beginning.
S.C. Code § 4-3-30