Zigzagging through the southern part of the Tibetan Plateau, the Himalayas, the highest and the youngest mountains in the world, comprise many parallel mountains running from east to west. The major part of the Himalayas lies on the border between China and India, and between China and Nepal. Extending some 2,400 km, it is 200-300 km wide. Major peaks have an average elevation of over 6,200 meters. They include the world's highest peak Qomolangma, rising 8,844.43 meters above sea level, towers over surrounding peaks on the Sino-Nepalese border. In this part of the world there are 42 peaks each with an elevation of over 7,000 meters, including four each with an elevation of over 8,000 meters.