《徐霞客游记·粤西游日记十三》
左边山崖的北面，有两个洞口向下坠入峡中，里边的洞向北，深削成深渊，底下有伏流清彻透明，两旁都是几十丈深的峭壁，往南伸展进去深远得不知通往何处。
左崖之北，有双门坠峡而下，内洞北向，深削成渊，底有伏流澄澈，两旁俱峭壁数十丈，南进窅然不知其宗。
On the north side of the left cliff, there are two holes that drop down into the canyon. The holes inside face north, and are deeply cut into the abyss. There is a clear and transparent stream below. Both sides are steep cliffs dozens of feet deep, stretching to the south so far that it is unknown where it leads.