Turia beneath the Grand Col glacier. Continue rightwards, circling the small rocky outcrop called Riondaz, and arrive, after a steep gully, on the Lavancher slopes. Join up with the first variant (a) ...

Advance Base Camp is located at about 21,300 feet on the lateral moraine of the East Rongbuk Glacier below the North Col. The site extends for several hundred yards up and down the moraine ...