Which river is the main outflow of Lake Baikal?

The Angara is the main outflow of Lake Baikal.

The Angara leaves Lake Baikal near the city of Irkutsk and flows generally north and west through Siberia. It later joins the Yenisey, making it a major headwater branch of that enormous river system, which ultimately reaches the Arctic Ocean.

Lake Baikal is unusual because it has many rivers flowing into it but only one surface outflow: the Angara. The lake receives water from hundreds of tributaries, including the Selenga, yet the Angara carries Baikal's discharged water onward. Its source is recognizable for the Shaman Stone, a rock near the river's emergence that has become a landmark.

The common trap is choosing the Yenisey. The Yenisey is the larger river that receives the Angara farther downstream, not the river that directly drains Lake Baikal. The Lena is another major Siberian river, but it flows independently toward the Arctic Ocean and is not Baikal's outlet.