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[too ng-goo-skuh; Russian toon-goo-skuh]
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  1. any of three tributaries of the Yenisei River in the central Russian Federation in Asia: the Lower Tunguska, 2000 miles (3220 km) long; the Upper Tunguska or the lower course of the Angara, 1151 miles (1855 km) long; and the Stony Tunguska, about 975 miles (1570 km) long.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for upper tunguska

Upper Tunguska

  1. See Tunguska


  1. any of three rivers in Russia, in central Siberia, all tributaries of the Yenisei: the Lower (Nizhnyaya) Tunguska 2690 km (1670 miles) long; the Stony (Podkamennaya) Tunguska 1550 km (960 miles) long; the Upper (Verkhnyaya) Tunguska which is the lower course of the Angara
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012