Llyn Idwal into Llyn Idwal from around Cwm Idwal. One small river flows out and joins the Afon Ogwen river at Pont Pen-y-Benglog near Ogwen Cottage, immediately above the Rhaeadr Ogwen waterfall. The lake is easily accessible on foot via a 900-metre long stone-paved path from Ogwen Cottage on the main A5 road. Another path encircles the lake. Two paths lead from opposite sides of the lake to the top of the ridge close to the Twll Du (Devil's Kitchen), but these paths become rather steep in places. They lead to Glyder Fach and Glyder Fawr. There is a small pebble beach
Western Cwm massive lateral crevasses which bar entrance into the upper Western Cwm. In this section, climbers must cross to the far right, over to the base of Nuptse to a narrow passageway known as the Nuptse corner. From there, climbers can see the upper of Everest—the first glimpse of Everest's upper slopes since arriving at Base Camp. The snow-covered, bowl-shaped slopes surrounding the Western Cwm reflect and amplify solar radiation, warming the valley basin despite its high elevation of through . On a sunny windless day, temperatures can reach up to . Western Cwm The Western Cwm () is a broad,