Or the "Roof of the World," a plateau traversed by mountain ridges and valleys, of the average height of 13,000 ft., NW. of the plateau of Thibet, connecting the mountain system of the Himalayas, Tian-Shan, and the Hindu Kush, and inhabited chiefly by nomad Kirghiz bands; territorial apportionments have for some time past been in the hands of Russian and British diplomatists.