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a river in Novosibirsk and Omsk oblasts, RSFSR, a right tributary of the Irtysh River (Ob’ River basin). The Om’ is 1,091 km long and drains an area of 52,600 sq km. Rising on the southeastern edge of the Vasiuganskaia Plain, the river flows, for the most part, across the Barabinskaia Lowland. It is meandering in its middle course. The Om’ is fed primarily by snow. High water occurs in May and July. The mean flow rate 121 km from the mouth is about 64 cu m per sec; maximum flow rate is 814 cu m per sec, and minimum flow rate is 0.80 cu m per sec. The river freezes in the second half of October or the first half of November and thaws in April or early May. The main right tributaries are the Icha, Kama, and Tartas. Timber is floated on the lower 100 km. During high water the river is navigable from the city of Kuibyshev. The city of Kalachinsk is also situated on the Om’, as is Omsk (at the mouth).