《水经注·卷十五》
又说：从鹿蹄之山到玄息之山，共有九座山。玄启也是山名，与灌举山一同构成九山的序列。
又曰自鹿蹄之山以至玄扈之山，凡九山，玄扈亦山名也，而通与讙举，为九山之次焉。
It also says: There were nine mountains from the Luti Mountain to the Xuanxi Mountain. Xuanqi is also a mountain name, which together with the Guanju Mountain makes up the order of nine mountains.