Grand Perron des Encombres, Mountain summit in Les Belleville, France

Grand Perron des Encombres is a 2,824-metre summit in the Vanoise massif, rising 661 metres above the surrounding terrain between the Maurienne and Belleville valleys. It lies 8 km east of Saint-Jean-de-Maurienne and 13.7 km west of the Aiguille de Péclet. The summit is a rocky peak in a landscape of steep mountains and glaciers, with tundra climate and alpine meadows on its slopes.

Grand Perron des Encombres rises to 2,824 metres, standing 661 metres above the surrounding terrain, on the ridge between the Maurienne and Les Belleville valleys. The summit lies 8 km east of Saint-Jean-de-Maurienne and 13.7 km west of the Aiguille de Péclet, which reaches 3,561 metres. Its slopes fall within a tundra climate, with average temperatures of 1 °C and about 1,479 mm of precipitation a year.

The summit stands on the watershed between the Maurienne and Les Belleville valleys, about 8 km east of Saint-Jean-de-Maurienne, and the surrounding slopes are classed as sparsely populated tundra, with only about five inhabitants per square kilometre. The Petit Col des Encombres below the peak is the pass walkers cross on the marked route to the top.

The summit lies 8 km east of Saint-Jean-de-Maurienne, and the surrounding terrain is mostly steep, rocky mountain slope. The local climate is tundra-like, with an average temperature of about 1 °C, around 13 °C in July and −11 °C in December, and roughly 1,479 mm of precipitation a year. Snow and weather therefore shape when the upper slopes can be walked.

Alpine ibex herds gather regularly on the plateau areas after Petit Col des Encombres and can often be spotted from the trail. These wild animals are adapted to the steep terrain and move across the high slopes throughout the day.