The Uchur is a river in Khabarovsk Krai and Yakutia in Russia, a right tributary of the Aldan. The length of the river is 812 kilometres (505 mi). The area of its drainage basin is 113,000 square kilometres (44,000 sq mi). The Uchur freezes in November and breaks up in May. Its main tributaries are the Uyan, Tyrkan, Gonam, and Gynym. The Gynym, a tributary of the Uchur, marks the southern border of the Sunnagyn Range.