'Edge' in the Bible

And between the passages where Jonathan sought to pass over unto the station of the Philistines is the edge of a rock on the one side, and the edge of a rock on the other side, and the name of the one is Bozez, and the name of the other Seneh.

The one edge is fixed on the north over-against Michmash, and the one on the south over-against Gibeah.