Lhotse is the fourth-highest mountain on Earth, after Mount Everest, K2, and Kangchenjunga. At an elevation of 8,516 metres above sea level, the main summit is on the border between Tibet Autonomous Region of China and the Khumbu region of Nepal. With Everest to the north and Nuptse to the west, Lhotse forms the apex of the massive horseshoe-shaped arc of the Everest massif.