sentences:  The main (and central) summit is 3,900 metres high and is located within the Swiss canton of Graubünden, although the border with the Italian region of Lombardy runs about 100 metres west of it at almost the same height (3,898 m).The western summit (3,823 m; on the international border) is named "Piz Spinas" and is the only one not covered by ice.The eastern summit (3,882 m; within Switzerland) is named "Piz Palü Orientale".