Marco Siffredi
Encyclopedia
Marco Siffredi was a French snowboarder and mountaineer. He was the first to descend Mount Everest
Mount Everest
Mount Everest is the world's highest mountain, with a peak at above sea level. It is located in the Mahalangur section of the Himalayas. The international boundary runs across the precise summit point...

 on a snowboard in 2001 via the Norton Couloir
Norton Couloir
The Norton Couloir or Great Couloir is a steep gorge high on the north face of Mount Everest in Tibet, which lies east of the pyramidal peak and extends to within 150 m below the summit....

. In 2002, he disappeared attempting to snowboard the Hornbein Couloir
Hornbein Couloir
The Hornbein Couloir is a steep gorge high on the northern side of Mount Everest in Tibet, that lies west of the summit pyramid and extends to about 150 metres below the summit itself.Its companion to the east of the summit is the Norton Couloir....

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