Breithorn Breithorn is a prominent 3,780-meter (12,402-foot) mountain in the Bernese Alps of Switzerland. Rising high above the upper Lauterbrunnen Valley, it forms part of the rugged alpine divide between the cantons of Bern and Valais and separates the Lauterbrunnental on its northern side from the Lötschental to the south. The mountain is often called …
