Arnenhorn, Mountain summit at 2211 meters in Bernese Alps, Switzerland

Arnenhorn is a 2211-meter mountain summit in the Bernese Alps positioned between the cantons of Vaud and Bern. Limestone cliffs rise steeply across its upper sections while gentler alpine meadows cover the lower slopes.

The mountain has served as a boundary between two cantons since 1803, when Vaud became independent from Bernese control. This border reflected the broader territorial reorganization that reshaped Switzerland during that era.

The area around this summit has long been shaped by Alpine farming traditions visible in the mountain meadows and pastoral landscape. Seasonal use of high pastures remains an important part of how people interact with this terrain.

The summit lies on the cantonal border between Vaud and Bern, above the eastern shore of Arnensee. Routes from the lake side climb through steep terrain, so allow several hours and carry water; the upper slopes are exposed to weather.

The Arnenhorn stands on the cantonal border between Vaud and Bern, and its eastern side drops toward the Arnensee, the lake it overlooks. The summit is listed at 2,211 metres, while the French-language sources name the same peak Arnehore and place it in the Vaud Prealps.