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Tobol (Russian: Тобол ; Kazakh: Тобыл) is a river in Kurgan and Tyumen Oblasts in Russia and Kazakhstan, left tributary of the Irtysh. The length of the Tobol River is 1591 km. The area of its drainage basin is 426,000 km². Average discharge at mouth is 805 m³/s. The lower reaches of the river freeze up in late October - November, the upper reaches in November. It stays under the ice until the second half of April - early May. The Tobol River is navigable within 437 km from its estuary.