Northern approach to Mount Everest #
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Image courtesy of NASA., under PD
From this point at approximately 6,100 m (20,000 ft) above sea level, the North Col - a sharp-edged pass carved by glaciers, center - is ascended to reach a series of progressively higher camps along the North Face of Everest, culminating in Camp VI at 8,230 m (27,000 ft) above sea level.
Climbers make their final push to the summit (not visible, just off the bottom edge of the image) from this altitude.