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Lena, river, Siberia Russia, rising west of Lake Baikal. The river flows first northeast and then gradually north for 4,400 km (2,700 mi) before emptying into Laptev Sea, an arm of the Arctic Ocean. The Lena drains a region of about 2.6 million sq km (about 1 million sq mi) and is navigable for some 3380 km (some 2100 mi). Yakutsk is the principal city on the river.