The mountain pasture Mastaun (open from the beginning of May to the end of October) is in the eponymous high mountain valley that branches off near Madonna di Senales/Unser Frau west of the Schnalstal Valley and extends up to a crown of 3000 m-peaks. A stream of crystal-clear water runs through the valley. The farmstead Mastaunhof, to which the mountain pasture belongs, was recorded in documents as early as 1356 and is one of the largest farms in the Schnalstal Valley. The pastures surrounding the mountain passture are unusually well-tended and simply magnificent. There are indications that many centuries ago the mountain pasture Mastaun was already in operation all year round.