English: This astronaut photograph highlights the northern approach to Mount Everest from Tibet (China). Known as the north-east ridge route, climbers travel along the East Rongbuk Glacier (image lower left) to camp at the base of Changtse mountain. From this point at approximately 6,100 meters above sea level (asl), climbers ascend the North Col—a sharp-edged pass carved by glaciers, at image centre—to reach a series of progressively higher camps along the North Face of Everest. Climbers make their final push to the summit (just off the top edge of the image) from Camp VI at 8,230 meters altitude. Located within the Himalaya mountain chain, Everest (or Sagarmatha in Nepali) is the Earth’s highest mountain, with its summit at 8,848 meters above sea level. Khumbutse mountain, visible at the lower right, has a summit elevation of 6,640 meters asl.