The Bulun (Russian: Булун), also known as "Rassokha", is a river in Magadan Oblast, Russia.

As it leaves the mountainous area, it bends towards the southwest in a floodplain fringing the southern side of the Yukaghir Highlands.

The river flows slowly in its last stretch meandering strongly and the floodplain becomes wider, with swamps and oxbow lakes.

At last the Bulun joins the right bank of the Korkodon 91 kilometres (57 mi) from its mouth.

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