It rises in the Chersky Range and meets the Kolyma near the settlement of Zyryanka.

It is 490 kilometres (300 mi) long, and has a drainage basin of 35,900 square kilometres (13,900 sq mi).

[1] Its main tributaries are Omulyovka, Olguya, Rassokha and Gonyucha, all from the West.

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