《徐霞客游记·黔游日记五》
又向南越过山阜，四次上登四次下降，共走四里，有土堡在南山岭头。
又南逾阜，四升降，共四里，有堡在南山岭头。
Heading south again, crossing the hill, going up and down four times, for a total of four li, there is an earthen fort on the peak of the southern mountain.