The town of Zermatt lies at the southern end of the Matter Valley (German: Mattertal), which is one of the lateral branches of the grand Valley of the Rhône. Zermatt is almost completely surrounded by the high mountains of the Pennine Alps including Monte Rosa (specifically its tallest peak, named Dufourspitze), Switzerland's highest peak at above sea level. It is followed by the Dom (), Liskamm (), Weisshorn () and the Matterhorn (). Most of the Alpine four-thousanders are located around Zermatt or in the neighbouring valleys.