S.C. Code Ann. § 4-3-310

Horry County is bounded as follows: by a line originating at the point where the boundary line between South Carolina and North Carolina intersects the center line of the Lumber River; thence southwestward following the center line of the Lumber River to its intersection with the center line of the Little Pee Dee River; thence southwestward and southeastward following the center line of the Little Pee Dee River to its intersection with the center line of the Great Pee Dee River; thence southeastward following the center line of the Great Pee Dee River to its intersection with the center line of Bull Creek; thence southeastward following the center line of Bull Creek to its intersection with the center line of the Waccamaw River; thence southward following the center line of the Waccamaw River to a point at latitude 33° 34' 22.623" N, longitude 79° 06' 03.848" W (North American Datum 1983) in the Waccamaw River; thence eastward following a straight line to a point at latitude 33° 34' 21.602" N, longitude 79° 00' 06.564" W (North American Datum 1983) on the seashore; thence on a true azimuth of 126° (bearing of S 54° E) to the Territorial Sea boundary; thence northeastward following the Territorial Sea boundary to its intersection with the seaward boundary between South Carolina and North Carolina; thence northwestward following the seaward boundary between South Carolina and North Carolina on a line as described by monuments located at latitude 33° 51' 50.7214" N, longitude 78° 33' 22.9448" W (NC-SC Granite Marker #2); latitude 33° 51' 36.4626" N, longitude 78° 33' 06.1937" W (NC-SC Granite Marker #1); and latitude 33° 51' 07.8792" N, longitude 78° 32' 32.6210" W (Bird Island-NC-SC Boundary 1977) (North American Datum 1927); thence northwestward following the boundary line between South Carolina and North Carolina to its intersection with the center line of the Lumber River, the point of origin. Effect of Amendment The 1992 amendment respecified the boundaries of Horry County.