《徐霞客游记·粤西游日记三十一》
半里，越过土冈下山，土冈内地势反而洼陷下去，土冈东西两侧的石崖全都劈向空中向前环抱，土冈横亘着接到两端的石崖。
半里，逾土冈而下，其内土反洼坠，其东西两崖俱劈空前抱，土冈横亘而接其两端。
After walking half a li, I climbed over a hillock and descended the mountain. The terrain on the other side of the hillock strangely sloped downwards, and the stone cliffs on both sides of the hillock split into mid-air and embraced forward, with the hillock connecting the two stone cliffs at their ends.