《徐霞客游记·黔游日记六》
又向西沿着南岭而行，见到这里的山坞都是向北下斜，然而大多是中部下洼而外面横亘着山岭。
又西循南岭而行，见其坞皆北向坠，然多中洼而外横亘者。
I headed west along the Nanling Mountains again, and saw that the mountain valleys here all sloped down to the north, but most of them were low in the middle and there were mountains lying across them outside.