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Mount Everest, the highest mountain in the world, is on the Tibet and Nepal border in Asia.Photograph © Alan Kearney/Getty Images
George Mallory and Sandy Irvine disappeared high on the Northeast Ridge in 1924.
The long Northeast Ridge of Mount Everest was attempted by several British expeditions in the 1920s and 1930s.Photograph courtesy ChinaReview.com
Mount Everest, straddling the Nepal and Tibet border, is the highest of the Seven Summits and the world's highest mountain.Photograph © Getty Images