《徐霞客游记·楚游日记九》
由回龙庵沿江岸向南行半里，水分成两条流来：一条从山谷中流出来，水流较大，它便是拖水；一条从南面流来，也可通小船，它发源于上武堡。
一名回龙庵。由回龙庵沿江岸南行半里，水分二道来：一自山谷中出者，其水较大，乃沲水也；一自南来者，亦通小舟，发源自上武堡。
From Huilong Temple along the river bank to the south for half a li, the water is divided into two flows: one flows out from the valley, with a larger flow, which is Tuoshui; the other flows from the south, which can also be navigated by small boats. It originates from Shangwubao.