《水经注·卷十四》
往南流过渔阳郡狐奴县北面，往西南与湿余水汇合，称为潞河；沽水往西南流经狐奴山西面，又往南流经狐奴县老城西面。
南过渔阳狐奴县北，西南与湿余水合，为潞河；沽水西南流径狐奴山西，又南径狐奴县故城西。
It flows to the south and passes through the north of Hunü County of Yuyang County, and merges with Shiyu water, in the southwest, to name it Lu River; Gu water flows to the southwest, passing through the west of Hunü Mountain, and then flows to the south and passes through the west of the old city of Hunü County.