a vast mountain system in S Asia, extending 2400 km (1500 miles) from Kashmir (west) to Assam (east), between the valleys of the Rivers Indus and Brahmaputra: covers most of Nepal, Sikkim, Bhutan, and the S edge of Tibet; the highest range in the world, with several peaks over 7500 m (25 000 ft). Highest peak: Mount Everest, 8848 m (29 028 ft)