《徐霞客游记·滇游日记三十六》
便首先溯干旱的峡谷沿北岭向东深入，二里路抵达下陷处，见有石崖并列，中间相夹峡底平坦。
乃先溯旱峡遵北岭东入，二里抵下陷处，见石崖骈列，中夹平底。
So I first went along the dry valley, going eastwards along the north ridge. After two li, I reached the depression, and saw that the stone cliffs were standing next to each other, with the valley bottom flat in the middle.