《徐霞客游记·滇游日记二十三》
穿到峡谷西，山峰环绕壑谷转，分出两条岔路：一条从山脊口往西下，沿北山向西北延伸；一条从山脊口直出，沿南山往西南延伸。
透其西，峰环壑转，分为二岐：一由脊门西下，循北山而西北；一由脊门直出，循南山而西南。
As we crossed the canyon to the west, the mountain peaks surrounded the gulley as it wound about, and two branch roads appeared: one to the west from the opening of the ridge, following the northern mountain and extending to the northwest; the other, from the opening of the ridge, went straight ahead, extending to the southwest by the southern mountain.