The Tara (Russian: Тара) is a river in Novosibirsk and Omsk Oblasts in Russia. It is a right tributary of the Irtysh River in the Ob's basin. The length of the river is 806 kilometers (501 mi). The area of its basin 18,300 square kilometers (7,100 sq mi). The Tara freezes up in late October or November and stays under the ice until late April or early May.