《水经注·卷二十二》
《春秋左传》说：楚子在狼渊攻打郑军。狼渊水往东南流入许昌县，流经巨陵城北边，这是郑的地域。
《春秋左传》曰楚子伐郑，师于狼渊是也。其水东南入许昌县，径巨陵城北，郑地也。
"Chunqiu Zuo Zhuan" said: The son of Chu attacked the Zheng army at Langyuan. The Wolf Abyss River flows southeast into Xuchang County and flows through the north of Julong City, which is the territory of Zheng.