《水经注·卷三十四》
捍关是凛君乘船下夷水时所设；弱关在建平郡姊归县边界上。
捍关，廪君浮夷水所置也。弱关在建平、秭归界。
Hangguan was set up by Emperor Lin when he took a boat down the Yishui River; Ruoguan is located on the border of Jianping County and Zi Gui County;