TAGS: the longest rivers in the world, rivers, the longest rivers, water, surface water, water flows, natural resources, flow river directions, major rivers in the world, major rivers on the planet, the world's longest rivers, top 10 longest rivers in the world, streams, currents of water, flooded areas, floods, large rivers, the largest rivers, Lena,the Lena river, about the Lena river, cruise on the Lena river, best tourism on the Lena river, the delta of the Lena river, the Lena river basin, the tributaries of the Lena river, the origin of the Lena river, the legend of the Lena river, description of the Lena river, the width of the Lena river, the length of the Lena river,one of the largest rivers in the world, one of the longest rivers in the world, Lena's ecosystem