Bratsk Reservoir is a reservoir of the Angara River, located in Irkutsk Oblast, Russia. It is named after the city of Bratsk, the largest city adjacent to the reservoir. It has a surface area of 5,470 square kilometres (2,110 sq mi) and a maximum volume of 169.27 × 1012 litres (37.2 × 1012 gallons).
This earth fill dam of the Bratsk hydroelectric plant was completed in 1967. It is 125 metres (410 ft) high and 4,417 metres (14,491 ft) long. The Baikal Amur Mainline railroad runs along the top of the dam. At the time of its inauguration, the reservoir was the largest artificial lake in the world. Its electrical power capacity is 4,500 MW