sentences:  It is the main settlement in the Matter valley (also called the Nikolai valley).It consists of the settlements of Riedmatten, Dorf, Stalu, Ze Schwidernu, Mattsand, Herbriggen, Breitmatten on the valley floor and the alpine settlement of Gasenried on the eastern slope.St Niklaus sits in the Mattertal, the steep valley that runs from Stalden to Zermatt, and is surrounded by some of the highest summits in the Alps, such as Dom and Weisshorn.