Piz Sardona is a mountain in the Glarus Alps, on the border between the cantons Glarus and St. Gallen. The 3,056 m (10,026 ft) high mountain overlooks the valleys of Sernf (Glarus) and Calfeisen. Less than 1 kilometre (0.62 mi) south of the summit lies the tripoint between the cantons of Glarus, St. Gallen and Grisons. The summit itself is the northernmost point above 3,000 metres in Switzerland.