《徐霞客游记·黔游日记一》
又往北一里，再次越过土山向西下延的山脊，这是上司、独山州的交界处，从此下岭沿东山行。
又北一里，复越土山西下脊，是为上司、独山州界，于是下岭循东山行。
Another mile to the north, I crossed the dirt mountain again and went down the ridge to the west. This is the junction of Shangsi and Dushan Prefecture. From then on, I went down the ridge and walked along the eastern mountain.