The Val Roseg is surrounded by the highest mountains of Graubünden and Eastern Switzerland. The highest are Piz Bernina (4,049 m), Piz Scerscen (3,971 m) and Piz Roseg (3,937 m). The southern upper valley is heavily glaciated: the Roseg Glacier on the west side and the Tschierva Glacier on the east side. The lake Lej da Vadret, which formed at the bottom of the Roseg Glacier during the 20th century, is the largest of the valley.