The Western Cwm

The Western Cwm is a gently undulating glacial valley basin at the foot of the Lhotse Face of Mount Everest. The Western part of this valley is traversed by climbers using the southeast route to the summit of Everest and accessed by climbing through the Khumbu Icefall. The central section of the valley is cut by massive lateral crevasses, which forbids the entrance into the upper Western Cwm. In this section, climbers need to cross the base of Mount Nuptse to a narrow passageway known as the Nuptse Corner. From where climbers can see the upper 2400 metres of Everest, the first glimpse of the upper slopes of Everest, since arriving at Basecamp.

The Western Cwm lies in the snow-covered, bowl-shaped valley basin, and despite its high elevation of 6000 metres to 6800 metres, on a sunny windless day, temperatures can reach up to 35 °C!

The name, Cwm was given by George Mallory when he saw it in the 1921 British Reconnaissance Expedition, the first to explore the upper sections of Everest, searching for routes for future summit attempts. Cwm is for a valley in Welsh.