Selenge

The Selenge is the great river of northern Mongolia and the lands south of Lake Baikal. Formed by the Ider and Delger Mörön, it receives the waters of the Dzhida, Chikoy and Khilok before spreading into a wide delta at the lake. The basin has warm summers and severe winters, and the river usually freezes from November to April. Its periodic floods can transform the lowlands along its course.