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In page Angara:

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The Angara (Russian: Ангара́, [ənɡɐˈra]; Buryat: Ангар, Angar, lit. "Cleft"[citation needed]) is a major river in Siberia, which traces a course through Russia's Irkutsk Oblast and Krasnoyarsk Krai. It drains out of Lake Baikal and is the headwater tributary of the Yenisey.[3] It is 1,849 kilometres (1,149 mi) long, and has a drainage basin of 1,039,000 square kilometres (401,000 sq mi).[1] It was formerly known as the Lower or Nizhnyaya Angara (distinguishing it from the Upper Angara).[4] Below its junction with the Ilim, it was formerly known as the Upper Tunguska (Russian: Верхняя Тунгуска, Verhnyaya Tunguska, distinguishing it from the Lower Tunguska)[5][6] and, with the names reversed, as the Lower Tunguska.[7]