The Eg River (Mongolian: Эгийн гол, Egiin gol ) is a river in the Khövsgöl and Bulgan aimags in northern Mongolia. It is the only outflow of Lake Khövsgöl and a tributary of the Selenge river. Wooden bridges exist near Khatgal and in Tünel sum, and a concrete bridge has been built in Erdenebulgan. In Bulgan aimag there is a bridge between Teshig and Khutag-Öndör sums.
Eg River some kilometers south of Khatgal
|Native name||Эгийн гол|
|⁃ location||near Khatgal|
|⁃ elevation||1,645 m (5,397 ft)|
|Length||475 km (295 mi)|
|Basin size||49,100 km2 (19,000 sq mi)|
|⁃ left||Üür River, Tarvagatai River|
Since the early 1990s there have been efforts to build a hydroelectric dam on this river. These attempts, however, have been opposed by several academic communities: archaeology because of the rich and not yet fully explored archaeological sites in area; geology because the area may have earthquakes. A dam would also displace parts of the local population as it floods some pastures and homesteads.