The Abakan (Russian: Абака́н; Khakas: Ағбан, Ağban), (from the Khakas word for "bear's blood") is a river in the Republic of Khakassia, Russia.

It rises in the western Sayan Mountains and flows northeast through the Minusinsk Depression to the Yenisey.

It is about 514 kilometres (319 mi) long from the Bolshoy Abakan's source, and 327 kilometres (203 mi) for the Abakan proper.

Its drainage basin covers 32,000 square kilometres (12,000 sq mi).

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