The Dammastock (3,630 m) is the highest mountain in the Urner Alps in Switzerland and is part of the Winterberg massif. Its summit ridge forms the border between the cantons of Uri and the Valais. It is the highest summit in the canton of Uri. The tripoint between the cantons of Berne, Valais and Uri lies near the Eggstock, north of the Dammastock. Politically, the Dammastcok is split between the municipalities of Göschenen (Uri) and Obergoms (Valais).