《徐霞客游记·粤西游日记二十》
再向北走入峡中，峡右便往北下洼出去，是下洞口，峡左却向北高耸飞渡，是上层，重叠成上方的楼阁，楼阁前水平地面临西北方，也有钟乳石柱隔在其中。
更北入峡中，其右则洼而北出，为下门，其左则高而北渡，为上叠，此明洞之西北二岐也。
Entering the canyon to the north again, the right side of the canyon dips northward, which is the lower entrance to the cave, but the left side of the canyon is towering and flying northward, which is the upper floor, overlapping to form an upper floor pavilion, the ground in front of the pavilion horizontally facing the northwest, and there are also stalactite columns across.