From the near-east to the near-west, the southern limit is specifically the Lower Saxon Hills: the ridge of the Teutoburg Forest, the Wiehen Hills, the Weser Hills, the Lower Saxon Börd; and the Harz (mountains/hill range). Thin escarpments of these, short of the far west mark the point where the west of the plain becomes the much smaller Westphalian Lowland. The Westphalian Lowland mirrors in size and elevation the Cologne Bight immediately south-west. Elements of the Rhenish Massif mark the latter's southern and eastern limits: the Eifel (shared with Belgium), Bergisches Land and the Sauerland.