Selenga (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.
"Selenga." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 19, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/selenga
"Selenga." The Columbia Encyclopedia, 6th ed.. . Retrieved April 19, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/selenga