Changtse
Changtse (Tibetan: "north peak") is a mountain situated between the Main Rongbuk and East Rongbuk Glaciers in Tibet, China, immediately north of Mount Everest. It is connected to Mount Everest via the North Col.
The given elevation of 7,543 metres is from modern Chinese mapping. Some authorities give 7,583 metres.
The Changtse Glacier flows north into the East Rongbuk Glacier. It is possible that the third highest lake in the world is in the Changtse Glacier at 6,216 metres (20,394 ft).
Timeline
1924 George Mallory and Andrew Irvine first to set foot on Changtse. They climbed the east ridge of Changtse to reconnoiter camp sites on the East Rongbuk Glacier.
1935 During the Mount Everest Reconnaissance a team with Eric Shipton, Edmund Wigram and Bill Tilman attempted the North Peak from their Camp IIA . On August 21 they got to within 1,500 feet (460 m) of the summit before very deep and soft snow forced them to turn back.
1952 Reconnaissance of Changtse via Changtse Glacier by Edmund Hillary and George Lowe and a group of Sherpas. They reached an estimated elevation of 21,500 feet (6,600 m) before turning back after running low on supplies.