The mountain rises 26,658 feet. Altitude sickness alone is a huge risk factor, in addition to strong winds, snow, rock falls and avalanches. Albert Mummery, a famous English mountaineer, described the wall: "The astounding difficulties of the southern face may be realized by the fact that the gigantic rock-ridges, the dangers of the hanging glacier and the steep ice of the north-west face-one of the most terri­fying faces of a mountain I have ever seen-are preferable to the south face."