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Yenisei (Енисе́й) is a river of Asia, which rises in two principal headstreams, the Bii-Khem (Бии-Хем) and the Kaa-Khem (Каа-Хем), on the plateau of NW Mongolia — the former on the S flank of the Sayan Mountains in 97° 30' E and 52° 20' N, and the latter in marshes a few miles W of Lake Kosso-gol .

They have a westerly course, but after uniting they turn N, through the Sayan Mountains in the wild gorge of Kemchik , in 92° E. Thence the river makes its way across the Alpine region that borders the Sayan Mountains on the N until it emerges upon the steppes at Sayansk (53° 10' N).

Augmented by the Abakan on the left and the Tuba on the right, it traverses the mining region of Minusinsk, approaches within 6 m. of the Chulyni , a tributary of the Ob, intersects the Trans-Siberian railway at Krasnoyarsk, and is joined first by the Kan and then by the Upper (Verkhnyaya) Tunguska or Angara, the Stony (Podkamennaya) TunguskaThe Stony Tunguska ( Russian: Podkamennaya Tunguska literally Understone Tunguska is a river in Siberia; it is a right tributary of the Yenisei and has a length of 1865 km. The name of the river comes from the fact that its significant stretches flow unde, and the Lower (Nizhnyaya) TunguskaThe Lower Tunguska (Russian Nizhnyaya Tunguska is a river in Siberia. It has a length of 2,989 km and is a right tributary of the Yenisei. It flows through the Irkutsk Oblast and the Krasnoyarsk Krai. Russian rivers., all from the right. The Yenisei continues north to the Arctic Ocean, joined on the left by the Zym , Turukhan and Ingarevka , and on the right by the Kureika and Daneshkina .

After the confluence of the Angara, the stream continues to widen out to 30 m., its bed being littered with islandAdriatic sea An island is any piece of land smaller than a continent and larger than a rock, that is completely surrounded by water. Very small islands are called islets . Although seldom adhered to, it is also proper to call an emergent land feature on as until it breaks into its deltaA delta is the mouth of a river where it flows into an ocean, sea, or lake, building outwards (as a deltaic deposit from sediment carried by the river and deposited as the water current is dissipated. Deltaic deposits of larger, heavily-laden rivers are c (225 km long). The length of the river is 4 102 kmA kilometre ( American spelling: kilometer (symbol: km is a unit of length equal to 1000 metres. It is approximately equal to 0. 621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include " klick" (or "click") and "kay". Click" is also used for (2543 mi.A mile is any of several units of distance, or, as physicists say, of length. Today, one mile is mainly equal to about 1609 metres on land and 1852 metres at sea and in the air, but see below for the details. Current definitions The meanings of mile that), and the area of its drainage basin 2 580 000 km² (970,000 sq. m.) It is navigable as far up as Minusinsk, a distance of 3 013 km (1840 m.), and is free from ice on the average for 155 days at Turukhansk and for 196 days between May and November at Krasnoyarsk.

The Angara drains Lake BaikalLake Baikal ( Russian: Ozero Baykal ), a lake in southern Siberia, Russia, between Irkutsk Oblast on the northwest and Buryatia on the southeast, near Irkutsk. Being 636 km long and 80 km wide, it is the largest freshwater lake in Asia ( 31,494 km²) and t, and is navigable from Irkutsk. Together with the Selenga, the main tributary of Lake Baikal, the Angara forms the longest headwater of the Yenisei. The length of the Yenisei-Angara system is 5550 km.

A canal connects the Great Kaz , a tributary of the Yenisei, with the Ket , an affluent of the Ob.