It is about 5 kilometers long and is drained by the Ri de Fontanalba, which flows into the Moesa near San Bernardino.
The valley rises evenly to the pass of Strec de Vignun (2'373 m), where it connects to the Val Curciusa.
The mighty rock Motta Caslasc rises to a height of 2300 m in the middle of the valley, between two alluvial plains.
The Piz Uccello lies north of the valley and can be reached using a marked mountain path.
Because of its exceptional beauty, the area of the San Bernardino Pass and Val Vignun as a landscape is considered of national importance.