Omolon
The Omolon is the principal tributary of the Kolyma in northeast Siberia. The length of the river is. The area of its basin is. The Omolon freezes up in October and stays under ice until late May through early June. The lower are navigable.
Course
It begins in the Kolyma Highlands, Magadan Oblast, less than from the Sea of Okhotsk, flows first northeast, with the Kedon Range to the west, then it bends northwest and forms part of the border of Magadan and Chukotka, with the Yukaghir Highlands to the west. At the western end of the Ush-Urekchen it turns north and crosses Chukotka, briefly enters the Sakha Republic and joins the Kolyma upstream from the Arctic. Its basin is surrounded by: branches of the Kolyma, Penzhina and others that flow south, Anadyr and Bolshoy Anyuy.Its main tributaries are the Kegali, the west-flowing Oloy, Oloychan, Kedon, Namyndykan, Molongda and Ango.