Lena

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Lena River in e central Russia. Rising in the Baikal Mountains, it flows n through the central Siberian uplands and empties through a wide delta into the Laptev Sea (part of the Arctic Ocean). Yakutsk is the only major town on its course. Although navigable for 3437km (2135mi) of its 4400km (2730mi) route, it is frozen from early autumn to late spring.