) is a river
and Tyumen Oblasts
, left tributary
of the Irtysh
. The length of the Tobol River is 1591 km
. The area of its drainage basin
is 426,000 sq km
. 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.
The Tobol River was one of the four important rivers of the Khanate of Sibir
. In 1428 the khan was killed in a battle with the forces of Abu'l-Khayr Khan
at the Battle of Tobol.
Cities and towns on Tobol