East Siberian Sea runoff into the East Siberian Sea is relatively small at about 250 km/year that makes only 10% of the total runoff in all the Arctic seas of Russia. The largest contribution is from the Kolyma River at 132 km, followed by the Indigirka River at 59 km. Most runoff (90%) occurs in summer; it is concentrated near the coast, owing to the weak river currents, and therefore does not significantly affect the sea hydrology. The water exchange between the neighboring seas is as follows. The annual outflow to the Laptev Sea, Chukchi Sea and Arctic Ocean is 3,240, 6,600 and
East Siberian economic region East Siberian economic region East Siberian economic region (, "Vostochno-Sibirsky ekonomichesky rayon") is one of twelve economic regions of Russia. In this area of plateaus, mountains, and river basins, the major cities—Krasnoyarsk, Irkutsk, Ulan-Ude, and Chita—are located along the Trans-Siberian Railroad. A branch line links Ulan-Ude with Mongolia and Beijing, China. There are hydroelectric stations at Bratsk, Krasnoyarsk, and Irkutsk. Coal, gold, graphite, iron ore, aluminum ore, zinc, and lead are mined in the area, and livestock is raised. All are in the Siberian Federal District East SIberian economic region accounted for 4 per cent of the national GRP in