The Biryusa (russian: Бирюса, in its lower reaches also called the Ona) is a river in

Irkutsk Oblast Irkutsk Oblast (russian: Ирку́тская о́бласть, Irkutskaya oblast; bua, Эрхүү можо, Erkhüü mojo) is a federal subject of Russia (an oblast), located in southeastern Siberia in the basins of the Angara, Lena, and N ...

and

Krasnoyarsk Krai Krasnoyarsk Krai ( rus, Красноя́рский край, r=Krasnoyarskiy kray, p=krəsnɐˈjarskʲɪj ˈkraj) is a federal subject of Russia (a krai), with its administrative center in the city of Krasnoyarsk, the third-largest city in Si ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eig ...

. The Biryusa is long, with a

drainage basin A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...

of . The river has its sources in the far southwestern areas of Irkutsk Oblast, at an elevation of , on the northern slopes of the

Sayan Mountains The Sayan Mountains (russian: Саяны ''Sajany''; mn, Соёны нуруу, ''Soyonï nurû''; otk, 𐰚𐰇𐰏𐰢𐰤, Kögmen) are a mountain range in southern Siberia, Russia ( Buryatia, Irkutsk Oblast, Krasnoyarsk Krai, Tuva Republic ...

. From the source area the river flows north over the

Central Siberian Plateau The Central Siberian Plateau (russian: Среднесибирское плоскогорье, Srednesibirskoye ploskogorye; sah, Орто Сибиир хаптал хайалаах сирэ) is a vast mountainous area in Siberia, one of the Gre ...

. It is crossed by the

Trans-Siberian railway The Trans-Siberian Railway (TSR; , , ) connects European Russia to the Russian Far East. Spanning a length of over , it is the longest railway line in the world. It runs from the city of Moscow in the west to the city of Vladivostok in the ea ...

Biryusinsk Biryusinsk ( rus, Бирюсинск, p=bʲɪrʲʉˈsʲinsk) is a town in Tayshetsky District of Irkutsk Oblast, Russia, located on the right bank of the Biryusa River (Angara's basin), northwest of Irkutsk, the administrative center of the obla ...

, which is a few kilometers west of

Tayshet Tayshet ( rus, Тайшет, p=tɐjˈʂɛt, lit. ''cold river'' in the Kott language) is a town and the administrative center of Tayshetsky District in Irkutsk Oblast, Russia, located northwest of Irkutsk, the administrative center of the obla ...

where the

Baikal Amur Mainline Lake Baikal (, russian: Oзеро Байкал, Ozero Baykal ); mn, Байгал нуур, Baigal nuur) is a rift lake in Russia. It is situated in southern Siberia, between the federal subjects of Irkutsk Oblast to the northwest and the Repu ...

starts. The Biryusa then turns northwest, and finally flows together with the Chuna and forms the Taseyeva (a tributary to the Angara). In Russian folklore it is the subject of several songs, for example, "Biryusinka."

References

Rivers of Irkutsk Oblast Rivers of Krasnoyarsk Krai {{Russia-river-stub