《徐霞客游记·滇游日记六》
于是往西在岭脊上走，此岭较平，南北两面都是山坞，而岭脊横贯其中。
于是西行岭脊之上，其岭颇平，南北皆坞，而脊横其中。
Then, I went west along the ridge of the mountains. This ridge is relatively flat, with mountain ravines on both the north and south sides, but the ridge runs across them.