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- Mackenzie Athabasca
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The Lena river- is one of the greatest water systems of our planet. It takes the 10th place among them being about 2700 miles. The Lena river basin covers about 1/5 of the Russia’s territory. The river has its source in the western hills of Baikal mountain ridge and flows into the Arctic Ocean. The Lena reaches 9,3 miles width in its middle stream, and about 15,6 miles in its lower stream.