The Lena (
Russian: Ле́на) in
Siberia is the 10th longest
river in the world and has the seventh largest
watershed. Rising at the height of 1640
m at its source in the
Baikal Mountains south of the
Central Siberian Plateau, 20
km west of
Lake Baikal, the Lena flows northeast, being joined by the
Kirenga River and the
Vitim River. From
Yakutsk it enters the lowlands, joined by the
Olyokma River and flows north until joined by its right-hand affluent the
Aldan River. The
Verkhoyansk Range deflects it to the north-west; then, after receiving its most important left-hand tributary, the
Viljuj River, it makes its way nearly due north to the
Laptev Sea, a division of the
Arctic Ocean, emptying south-west of the
New Siberian Islands by a delta 10,800 km² in area, and traversed by seven principal branches, the most important being
Bykov, farthest east.
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