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| | Selenga |
 | | Selenga, 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. |
 | | Orkhon - Orkhon, river, c.300 mi (480 km) long, rising in the Khangai Mts., N central Republic of Mongolia,... |
 | | 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. |
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