Mount Saint Peter, also referred to as Caestert Plateau, is the northern part of a plateau running north to south between the valleys of the river Geer to the west, and the Meuse to the east. It runs from Maastricht in the Netherlands, through Riemst in Belgian Limburg almost to the city of Liège in Belgium, thus defining the topography of this border area between Flanders, Wallonia and the Netherlands. Wikipedia