Lobuche peak has two summits, east and west, with heights of 6119 m and 6145 m respectively. A continuous ridge connects them, but this ridge is long and there is a considerable loss and gain of height. The east peak is recognized as a trekking peak, whereas the west peak is known as an expedition peak. Lobuche, being an attractive mountain, offers various existing routes and also the potential for new ones. The dark triangle of the rocky east face rises over the moraines of the Khumbu glacier to a spectacular skyline, forming the south ridge. Lobuche east is reached by descending a marked notch and then climbing steep snowy slopes to the top. On most occasions, the mountain is climbed on the summit ridge, only as far as a subsidiary snow summit (or false peak), south–east of the true peak and before the notch. Laurence Nielson and Ang Gyalzen Sherpa made the first ascent of Lobuche east, on 25 April 1984, although it is possible that others had reached the summit before, but did not record their climbs.