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Ust-Omchug (Russian: Усть-Омчуг) is an urban locality (an urban-type settlement) and the administrative center of Tenkinsky District of Magadan Oblast, Russia, located at the 271-kilometer (168 mi) mark of the highway to the northwest of Magadan. Population: 3,914 (2010 Census); 4,867 (2002 Census); 11,343 (1989 Census).
Urban-type settlement status was granted to Ust-Omchug in 1953.
Thirty-five miles north from the settlement there are couple of other abandoned settlements that once were part of the TenLag. They are Butugichag and Lower Butugichag. The settlements were part of the Soviet correctional system of GULAG.
Ust-Omchug has a very cold subarctic climate (Köppen climate classification Dwc). Winters are prolonged and very cold, with up to eight months of sub-zero high temperatures, so that the soil remains permanently frozen. Permafrost and tundra cover most of the region. Average temperatures range from −32.6 °C (−26.7 °F) in January to +12.7 °C (54.9 °F) in July.