This region is studded with large lakes, e.g. Uvs 720 m above sea level, Khyargas, Dorgon and Khar 1,170 m, and traversed by various mountain ranges, of which the principal are the Tannu-Ola Mountains, running roughly parallel with the Sayan Mountains as far east as the Kosso-gol, and the Khan Khökhii mountains, also stretching west and east.