《水经注·卷九》
淇水又向北弯，向西转，流经顿丘北边。所以阐驯说：顿丘在淇水以南。
淇水又北屈而西转，径顿丘北，故阚駰云：顿丘在淇水南。
The Qi River bends north again, turns west, and flows through the north of Duqiu. Therefore, Chan Xun said: Duqiu is south of the Qi River.