《徐霞客游记·粤西游日记九》
于是走出一个石圈卷门，共走一里，越过小桥往东行，有两个洞口都朝向西方，一个排列在南，一个排列在北。
乃出一石圈卷门，共一里，越小桥而东，有两洞门俱西向，一南列、一北列。
They then walked out of a stone circle and gate for about a third of a mile, and then crossed the bridge and walked east. There were two holes facing west, one to the south and one to the north.