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a river in Altai Krai and Kemerovo Oblast, RSFSR; a right tributary of the Ob’. The Chumysh River is 644 km long and drains an area of 23,900 sq km. It rises in the Salair Ridge at two sources, the Kara-Chumysh and the Tom’-Chumysh. The upper course has many rapids; near the mouth the river divides into two branches. The Chumysh is fed primarily by snow. The mean flow rate 74 km from the mouth is 146 cu m per sec. The river freezes in the first half of November and opens up in the second half of April. It is used to float timber. The river is navigable for 196 km to the Zakharovo landing.