Glarus Süd is one of three municipalities of the Swiss canton of Glarus, with the others being Glarus and Glarus Nord.The municipality comprises the upper Linth valley, and the entire Sernf valley, and has an area of 426 km2 (164 sq mi). It includes the villages of Betschwanden, Braunwald, Diesbach, Elm, Engi, Haslen, Hätzingen, Leuggelbach, Linthal, Luchsingen, Matt, Mitlödi, Nidfurn, Rüti, Schwanden, Schwändi and Sool.