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Summary Article: Yenisey from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

One of the main rivers in Russia, rising in the Sayan Mountains in the Asian Tuva region and flowing generally north through the Central Siberian Plateau into the Arctic Ocean; length 4,100 km/2,550 mi. The Yenisey has a drainage basin of 2,580,000 sq km/996,000 sq mi, and most of this area is at a height of between 487 m/1,600 ft to 700 m/2,300 ft above sea level. The Angara, the principal tributary of the Yenisey, helps to keep the river flow even because of its constant source of water in Lake Baikal. Navigable throughout almost its entire course, the Yenisey's chief ports are Dudinka, Igarka, and Krasnoyarsk.

In its upper reaches, the Yenisey is a mountainous river with rocky shores and rapids; from below Krasnoyarsk to Dudinka, it forms a wide valley that divides the West Siberian lowland from the Central Siberian plateau. The main tributaries are the Angara, Podkamennaya Tunguska, and Nizhnyana Tunguska. The river freezes over between late October and early June in the lower reaches, and between mid-November and late April in the upper reaches. It is chiefly used for the transportation of timber, grain, and coal, and is navigable by sea-going vessels as far as Igarka. Hydroelectric power stations have been built along its course. The Yenisey region was first explored by Russia in the 16th century and its basin colonized from the 17th century. Forced labour camps were a feature of this bleak region during the Soviet period (see Norilsk).

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