《水经注·卷三十六》
所以各种书籍记述诸水，有的说注入若水，也有说注入绳水，又有说到焚道入江。这正是因为各水流注相通，成为一水之故，除却此水，再也没有别的可相对应的河流了。
是以诸书录记群水，或言入若，又言注绳，亦咸言至道入江，正是异水沿注，通为一律，更无别川可以当之。
Therefore various scripts record all the waters, and some say it flows into Ruo, some say into Ruo, and others say into Fen. This is exactly because the flow of all waters were connected, making it one water, other than this water, there is no other river that correspond with it.