《徐霞客游记·黔游日记八》
随即顺着山坡往南上走半里，又进峡向西上走一里，又往南翻越在山坳山脊间半里。
既而循坡南上者半里，又入峡西上者一里，又南逾坳脊间半里。
Then I walked south along the hillside for half a mile, then walked west into the canyon for a mile, and then climbed over a half-mile ridge between the ravine and the mountain ridges to the south.