《水经注·卷二十四》
《地理志》说：淮水上口在封丘县承接姊水，往东北流到都关，注入羊里水。
《地理志》曰：濮水首受泲沛于封丘县东北，至都关，入羊里水者也。
"Geography" states: The upper Huai River is connected to the Zhe River in Fengqiu County, flowing to the northeast to Duguang and into the Yangli River.