The Grisons lies fully within the Alps, with elevations above sea-level ranging from . It is both one the highest and lowest cantons, and the second-highest when considering mean elevation. As a consequence, its topography is extremely rugged and many of the highest settlements in the country (and Europe) are found there, notably in the Upper Engadin. The mountains are numerous and largely over 1,000 summits can be found in the canton. The highest is Piz Bernina, closely followed by numerous peaks in the homonymous range. Other prominent mountains are Piz Russein, Piz Kesch, Calanda, Aroser Rothorn and Rheinwaldhorn, see list of mountains of Graubünden for a more exhaustive list. The canton includes numerous other subranges of the Alps, notably the Bregaglia, the Glarus, the Gotthard, the Lepontine, the Plessur, the Oberhalbstein, the Albula, the Silvretta and the Rätikon ranges.