The Güferhorn is a mountain in the Lepontine Alps , located between the valleys of Vals and Hinterrhein in Graubünden. At 3,379 metres above sea level it is the highest summit of the Lepontine Alps lying east of the Rheinwaldhorn . The northern side of the massif is covered by the Güfergletscher, a 2 kilometres long glacier. It lies above 2,600 metres on the east side of a ridge starting at the summit of the Güferhorn and separating the valleys of Länta and Canaltal, both converging at the Zervreilasee , south of Vals.