Gamser Rugg, Mountain summit in canton St. Gallen, Switzerland.

Gamser Rugg is a 2076 meter mountain peak with steep limestone cliffs on its southern side and a more gradual northern slope. The overall shape results from different rock layers that determine how the mountain looks and can be approached.

The name Gamserrugg refers to the chamois (Gämsen) that once lived on the mountain; the ridge rises evenly from north to south like the neighbouring Churfirsten to the west. The Gamsalp lies about halfway up, and the Nideri notch separates the ridge from the rockier peaks of the Alvier chain to the east. The Plisatal valley divides it from the Chäserrugg, whose saddle lies just over 100 metres below the Gamserrugg summit.

The name Gamserrugg refers to the chamois (Gämsen) that once lived on the mountain. On the Gamsalp at mid-height stands the valley station of a chairlift from Oberdorf, and in summer an alpine farmer lives and works there. A ski lift starts just below the alp and runs up to a knoll at 2070 m.

A chairlift runs from the Oberdorf up to the Gamsalp, where a mountain farmer stays in summer. Just below the Gamsalp a ski lift climbs to the knoll at 2070 m. Trails lead from the summit area over the saddle into the Seeztal, down the steep south flank, or east to the Voralp and Voralpsee.

A geological trail with twelve educational stations circles the mountain and reveals the formations of Upper Cretaceous limestone and Garschella layers. These stations let visitors understand the complex rock history of the mountain directly on site.