- a river in the S Russian Federation in Asia, flowing NW from Lake Baikal to the Yenisei River: called Upper Tunguska in its lower course. 1,151 miles (1,855 km) long.
- a river in S Russia, in Siberia, flowing from Lake Baikal north and west to the Yenisei River: important for hydroelectric power. Length: 1840 km (1150 miles)
