The Tschingelhörner (also spelled Tschingelhoren) are a chain of mountain peaks in the Glarus Alps, located on the border between the Swiss cantons of Glarus and Graubünden. They are composed of several summits on a 1 km long ridge, of which the highest is named Grosses Tschingelhorn (2,849 m). The mountain is located between Elm and Flims, west of the Segnas Pass (2,627 m). East of the main summit is the Martinsloch, a 6-by-18-metre (20-by-60 ft) triangular breakthrough, or hole, through which the sun shines at particular times of the year.