《徐霞客游记·黔游日记四》
从峡谷西头走半里，又听见潺潺的流水声，有水流自深深的坑谷底向东流注于山坳之下，确确实实这就是山坳东头穿过洞穴的水流了。
从峡西下半里，又闻水声潺潺，有水深自坑底东注坳下，信乎即坳东透穴之水矣。
Walking half a mile from the west end of the canyon, he heard the sound of running water again. Water was flowing from the bottom of a deep valley pit eastward and pouring into the bottom of the mountain pass; this was indeed the water flowing through the cave at the east end of the mountain pass.