Savannah River
The bulk of Lincoln County, from just south of Lincolnton heading north, is located in the Upper Savannah River sub-basin of the Savannah River basin, with the exception of a tiny sliver of the northernmost section of the county, which is located in the Broad River sub-basin of the larger Savannah River basin. The southern portion of the county is located in the Little River sub-basin of the same Savannah River basin.