The term Central Eastern Alps may also be used more broadly to refer to a larger area of the Eastern Alps, mainly located in Austria, extending from the foot of the Bergamasque Alps at Lake Como and the Bernina Range in the Graubünden canton of eastern Switzerland along the Liechtenstein shore of the Rhine in the west as far as to the lower promontories east of the Mur River including the Hochwechsel in Austrian Styria. The valleys of the rivers Inn, Salzach and Enns mark their northern boundary, the Drau river (roughly corresponding to the Periadriatic Seam) their southern border. In the proposed SOIUSA system, the Central-eastern Alps include the Rhaetian Alps, of which the Bernina Range includes the 4,049-meter Piz Bernina in Switzerland, the easternmost 4,000-meter peak of the Alps. In the AVE system, however, the full list of mountain groups in the Alpine Club classification of the Eastern Alps includes the Bernina and neighboring ranges within the Western Limestone Alps, not the Central Eastern Alps as the Alpine Club defines them.