《水经注·卷三》
水往西北流到老城东南。土军水发源于道路左边的高山上，往西南注入龙泉。
其水西北流，至其城东南，土军水出道左高山，西南注之。
The water flows northwest to the southeast of the old city. The Tuchun River originates from the high mountains on the left side of the road and flows into the Dragon Spring southwestward.