《徐霞客游记·滇游日记四十三》
岭脊稍向中间下凹，是从东北的定西岭分支，往西延伸为甸头山，又分为两支：一条支脉向北转，傍着洱水往北延到苍山后；一条支脉南下，绵亘为蒙化府西面夹立的山，而此处是它的山脊。
脊稍中坳，乃东北自定西岭分支，西度为甸头山，又分两支：一支北转，挟洱水北出苍山后，一支南下，亘为蒙化西夹之山，而此其脊出。
The mountain ridge dipped slightly in the middle; it was a branch off Dingxi Ridge to the northeast, extending west to Dian-tou Mountain, which then divided into two branches: one branch turned north, running beside Erhai Lake all the way north to the back of Cangshan Mountain; the other branch continued south, forming the mountain range that straddled the west side of Menghuhua Prefecture. This was the mountain ridge they were on.