The Ishim River reference article from the English Wikipedia on 24-Jul-2004
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Ishim River

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The Ishim River (Иши́м, another name is Esil River) is a river running through Kazakhstan and Russia. Its length is 2450 km (1530 miles). It is a left tributary of the Irtysh River. The Ishim River is partly navigable and passes through Astana, the capital of Kazakhstan.

Ishim also is the name of a town in Russia: Ishim, Russia