Nesthorn 🏔️ Overview Nesthorn is a striking 3,821-meter mountain in the southern Bernese Alps of Switzerland. Rising north of the Rhône Valley in the canton of Valais, it stands between the glaciated Oberaletsch basin and the deep Gredetschtal valley. Although Nesthorn is lower than the neighboring Aletschhorn and Bietschhorn, its substantial prominence, steep ridges, and …