Panorama from Elm village (977 m) towards the Tschingelhörner, at the time as the sun shines straight through the Martinsloch, illuminating the church tower in Elm.
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The Tschingelhörner is a mountain ridge in the Glarus Alps, located on the border between the cantons of Glarus and Graubünden in Switzerland. It is composed of differents summits on an about 1 km long ridge.
The ridge is part of the Swiss Tectonic Arena Sardona and is an UNESCO World Heritage Site. The Martinsloch is one of the largest and most well-known geological treasures in the Elm region. It is a rock window that is 17m tall and 19m wide, located at some 2'600m above sea level in the large Tschingelhorn mountain.
Twice a year - on 13/14 March at 8.53 a.m. and on 30 September/1 October at 9.32 a.m. - the sun briefly shines straight through the Martinsloch just before it is due to rise, illuminating the church tower in Elm.
At set intervals, the moon can also be seen through the Martinsloch.