The Kolyma River (Russian: Колыма́, IPA: [kəlɨˈma]) is a river in northeastern Siberia, whose basin covers parts of the Sakha Republic, Chukotka Autonomous Okrug, and Magadan Oblast of Russia. It rises in the mountains north of Okhotsk and Magadan, in the area of 62°N 149°E and empties into the Kolyma Gulf (Kolymskiy Zaliv) of the East Siberian Sea, a division of the Arctic Ocean, at 69°30′N 161°30′E. The Kolyma is 2,129 kilometres (1,323 mi) long. The area of its basin is 644,000 km².
The Kolyma is frozen to depths of several metres for about 250 days each year, becoming free of ice only in early June, until October.