Biryusa

The Biryusa rises on the northern slopes of the eastern Sayan Mountains and flows through the forested country of southern Siberia. Farther north it turns northwest and joins the Chuna, forming the Taseyeva, which in turn reaches the Angara. From mountain headwaters to the broad taiga, the river belongs to the extensive Yenisei drainage system, carrying water across a landscape of forest and long winters.