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Hornbein Couloir : ウィキペディア英語版 | Hornbein Couloir
The Hornbein Couloir is a notable narrow and steep couloir high to the west on the north face of Mount Everest in Tibet, that extends from about 8000 m to 8500 m elevation, 350 metres below the summit. For the first 400 m vertical, the couloir inclines at about 47 degrees, and the last 100 m is narrower and steeper with about a 60 degree average incline.〔(Hillmap )〕 To the east on the north face with less angle is the much larger Norton Couloir. == Origin of the name ==
The couloir was named after a member of the 1963 U.S.A. Everest Expedition, Thomas Hornbein, who was on the first ascent.
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