《水经注·卷三十八》
纯水源出吴昌县东南的纯山，往西北流，又往东流经县南，又往北流经该县老城下。
水源出其县东南纯山，西北流，又东径其县南，又北径其县故城下。
Pure water originates from Chunshan in the southeast of Wuchang County, flows northwest, and then east through the south of the county, and then north through the old city of the county.