 The Khanate of Sibir was conquered by the Russians in the 1580s.The Russians started building fortresses and towns next to the sites of former Tatar towns; one of the first Russian towns in Siberia (after Tyumen) was Tobolsk, founded in 1587 at the fall of the Tobol into the Irtysh, downstream from the former Qashliq.Farther east, Tara was founded in 1594, roughly at the border of the taiga belt (to the north) and the steppe to the south.