《水经注·卷十七》
东亭水又往西流，右边有叹沟水，稍西又有鞠谷水，发源于东南方，二溪都往西北流，注入东亭川。
东亭水又西，右则叹沟水，次西得宕谷水，水出东南，二溪西北流，注东亭川。
The Dongting River flows westward again, with the Tangu River on the right, and the Ju Valley River a little further west, originating in the southeast. The two streams flow northwest into the Dongting River.