The Bietschhorn is a mountain in the Bernese Alps, on the border between the cantons of Berne and Valais. It has a height of 3,934 metres (12,907 ft) which makes it one of the highest peaks in the region. In the Lötschen valley (Lötschental) it is also called "Nesthorn". There's a glacier which is called "Nestgletscher". There's another mountain called Nesthorn, in Valais, nearby. A part of the Bietschhorn is called Kleines Nesthorn. This part rose to fame, because it was what started the 2025 Blatten landslide.