Nepalese Sagarmatha `head of the earth' the world's highest mountain, in the Himalayas, on the China-Nepal frontier; height 8,872 m/29,118 ft. It was first climbed by Edmund Hillary and Tenzing Norgay 1953. Many expeditions have since scaled the peak. The English name comes from George Everest (1790-1866), surveyor-general of India. In 1987 a US expedition obtained measurements of K2 that disputed Everest's claim to be the highest mountain, but recent satellite measurements have established Everest as taller.