It is located on the lower Heinzenberg and consists of the two settlements of Ober- and Unter-Masein and the hamlets of Dalaus, Cresta und Lochmüli.
The municipality is located in the Thusis sub-district, of the Hinterrhein district in the Heinzenberg.
The municipality is located in the Thusis sub-district, of the Hinterrhein district and is located on the Heinzenberg mountains.
It consists of the haufendorf (an irregular, unplanned and quite closely packed village, built around a central square) village of Sarn on the Heinzenberg mountains.
The Ski School of Sarn/Heinzenberg in Switzerland claims to hold the world record with a ski class of 594 pupils - which is really amazing taking into account the size of this tiny resort with one chairlift an one T-Bar lift only.