mt everest west ridge

alpine asia athlete base camp changtse chola chumbu climbing col conquest danger everest expedition extreme glacier goal hillary himalaya himalayas ice icefall kala khumbu khumbutse landscape lhotse lingtren man mount mountain mountaineering nepal ngozumba norgay nuptse patthar peak postcard pursuit range recreation ridge sagarmatha sherpa silhouette snow sport summit tenzing tibet trek trekking west