The Chaun (Russian: Чаун) is a stream in Far East Siberia.

It flows roughly northwards, passing through the sparsely populated areas of the Siberian tundra.

After joining they flow into the East Siberian Sea at Chaun Bay, 100 kilometres (62 mi) south of the port town Pevek.

The Chaun and its tributaries belong to the Chukotka Autonomous Okrug administrative region of Russia.

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