The Uchur (Russian: Учур; Yakut: Учур, Uçur) is a river in Khabarovsk Krai and Yakutia in Russia, a right tributary of the Aldan (Lena's basin).[1] 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).[2] The Uchur freezes up 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.[3][4]