The 320 km (200 mi) partly navigable Upper Angara River feeds into the northern end of Lake Baikal from the Buryat Republic but the largest inflow is from the Selenga which forms a delta on the south-eastern side. The longest tributaries rise on the eastern slopes of central Mongolia's Khangai Mountains. Another tributary, the Tuul passes through the Mongolian capital, Ulan Bator while the Egiin Gol drains Lake Khövsgöl (500 km) downstream, where the 124 m (407 ft) dam built in the 1960s produces 4500 MW. The resultant reservoir is nicknamed Dragon Lake because of its outline. The tributary Oka and Iya rivers, which rise on the north slopes of the Eastern Sayan Mountains, form the 'jaws' and 400 km (250 mi) of the Angara forms the 'tail'. There are newer dams almost as large at Ust-Ilimsk 250 km (155 mi) downstream (also damming the tributary Ilim river) and Boguchany a further 400 km (250 mi) downstream (not operational). Further dams are planned but the environmental consequences of completely taming the Angara are leading to protests which may prevent funding.Angarsk, the center of the expanding Eastern Siberian oil industry and site of a huge Yukos-owned refinery, lies 50 km (31 mi) downstream of Irkutsk. A major pipeline takes oil west, and a new one is being built to carry oil east for supply to Japan from the Sea of Japan port of Nakhodka. The exact potential of Eastern Siberia is unknown, but two new major fields are the Kovyktinskoye field near Zhigalovo 200 km (125 mi) north of Irkutsk and the extremely remote Verkhnechonskoye field 500 km (310 mi) north of Irkutsk on the Central Siberian Plateau.
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