mountain range in the Transbaikalia region of Chita oblast (province) and Buryatiya, in far eastern Russia. The range is some 500 miles (800 km) long northeast–southwest and reaches a maximum height of 5,512 feet (1,680 m) in Mount Kusotuy. Formed principally of granites and gneisses, it has been uplifted and much-fractured. The highest peaks are bare, but most of the range is densely forested with larch, spruce, and pine. The Trans-Siberian Railroad crosses the range by a low pass at Yablonovaya.