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(sĕlĕng-gä`), river, 616 mi (992 km) long, rising in the Khangai Mts., NW Republic of Mongolia, and flowing east, then north, across the Mongolian-Russian border to Lake Baykal; the Orkhon River is its main tributary. The Selenga, navigable from May to October, is Mongolia's chief river; its role as a transportation artery decreased with the advent of the Trans-Baykal RR. Ulan-Ude, an important Russian rail junction, river port, and industrial center, is the largest city on the river.



a river in the Mongolian People’s Republic and the Buriat ASSR. The Selenga is formed by the confluence of the Ider and Muren rivers and empties into Lake Baikal, creating a delta 680 sq km in area. Approximately half of the river water that enters Lake Baikal comes from the Selenga. The river is 1,024 km long from the source of the Ider River; 409 km of the lower course is in the USSR. It drains an area of 447,000 sq km. The main tributaries are the Egin-Gol and Orkhon in Mongolia and the Dzhida, Chikoi, Khilok, and Uda in the USSR.

The Selenga is primarily a flatland river, with narrow sections of the valley (to 1–2 km) alternating with troughlike wider sections (to 20–25 km) where it frequently divides into branches. It has low spring highwater, with flash floods in summer and fall caused by rain; the low-water period occurs in winter. The mean flow rate is 310 cu m per sec near the Mongolia-USSR border and 935 cu m per sec 127 km from the mouth. The river is frozen over from November through April. There is regular navigation to Sukhe-Bator in Mongolia. The capital of the Buriat ASSR, Ulan-Ude, is situated on the Selenga, as is the urban-type settlement of Selenginsk.


Kuznetsov, N. T. Gidrografiia rek Mongol’skoi Narodnoi Respubliki. Moscow, 1959.
Cherkasov, A. E. Vodnye resursy rek basseina Baikala, ikh ispol’zovanie i okhrana. Irkutsk, 1973.


References in periodicals archive ?
The active phase of the Selenga 2018 exercise is to be held at the Burduna Training Centre in the Republic of Buryatia, Eastern Military District.
([paragraph]) There are 43 villages in Gbo and 32 in Selenga, with a combined estimated population in the two chiefdoms of approximately 13,000.
Konovalov, N.A.--1930--Issue of the vegetation in Selenga delta--In: Proceedings Commission of Lake Baikal investigation.
The training programme's first semester would last 33 months, Selenga said, adding most of Afghan youth were jobless and the programme would provide them work opportunity.
The Selenga river is the largest tributary to Lake Baikal.
Another site where pollution is very worrying is the mouth of the River Selenga, which carries 50% of all the water entering Lake Baikal.
The Orkhon flows northward and joins the Selenga; the river then continues northward to flow into Lake Baikal in Siberia.
The northern half of Baikal isn't polluted by the level of industrial and human wastes that flows into it from the Selenga River in the southeast and the towns of Baikalsk and Slyudyanka farther south.
A paper plant, a municipal sewage facility, and a score of factories dump their effluents into the Selenga River at Ulan Ude to the southeast, joining pollution from industry at Ulan Baatar in Mongolia.
The Russian-Mongolian military exercise, headlined Selenga after the river that originates in Mongolia and flows into Russia's Lake Baikal, are held on an annual basis.
The term and venue for the first planning conference have been agreed to prepare for the Selenga 2018 joint Russian-Mongolian military drills.
mammillatus is confined to northern waters including large tributaries of Lake Baikal such as the Selenga River (found at a distance of 1.5 km from Lake Baikal) and the Upper Angara River, but never Lake Baikal itself [27].