《徐霞客游记·黔游日记八》
忽然转向东，水顺着洞的北侧流，路沿着洞的南侧走，洞的东面竟然弯隆而起十分宽阔，遥望洞内，光影陆离，波涛之声沸腾，但行走之处仍然是暗暗的。
入洞之中，则扩然无间，水循洞西，路循洞东，分道同趋，南向十余丈，渐昏黑矣。
Suddenly turning east, the water flowed along the north side of the cave, and the path along the south side of the cave. The east side of the cave turned out to be curved and very wide. Looking into the cave, the light and shadow were changing, and the sound of waves was boiling, but the place where we were walking was still dark.