Lena- a river in Russia, the largest river of Central Siberia flows into the Laptev Sea of the Arctic Ocean. The length along with the delta is 4400 km. In some cases, the length is 4294 km without taking into account the Bykovskaya channel (106 km) in the delta of Lena. The area of the basin is 2490 thousand sq kmIt flows through the territory of the Irkutsk region and Yakutia, some of its tributaries belong to the Transbaikal, Krasnoyarsk, Khabarovsk, Buryatia and Amur regions. Lena - the largest of the Russian rivers, whose basin lies entirely within the country. It is also the largest river in the world, completely flowing in the permafrost region.
Freezes in the reverse autopsy order - from the lower reaches to the upper reaches.