Black Creek is a 13.0-mile-long (20.9 km) tributary of the St. Johns River. It is located in Clay County, Florida. Black Creek has two major tributaries; North Fork Black Creek and South Fork Black Creek. North Fork originates as an outflow from Kingsley Lake and flows north and then east through Camp Blanding and Jennings State Forest, meeting South Fork in Middleburg, Florida. North Fork Black Creek has Yellow Water Creek and Big Branch as its main tributaries. South Fork Black Creek is fed by areas of wetlands and numerous small streams.