《徐霞客游记·粤西游日记十八》
下去一丈多，积为一个水潭，不十分幽深清澈，指认为 龙潭 。
下丈余，汇为一潭，不甚深澈，指为 龙潭 云。
Going down for about a zhang, it accumulates into a pool of water, which is not very deep or clear, and is referred to as Dragon Pool.