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a river in Altai in the Gorno-Altai Autonomous Oblast; a left tributary of the Chulyshman River. The Bash-kaus is 219 km long and drains a basin of 7,770 sq km. It rises from a cirque lake in the eastern part of the Kuraiskii Mountain Range. In its lower reaches, it flows in a narrow valley, which often turns into a rocky canyon. The mean annual flow rate near the village of Ust’-Ulagan measures about 30 cu m3/sec.