| Ider River | |||||||||||
| Name Other: | Ider gol | ||||||||||
| Name Etymology: | mn|Ider, "young, youthful") | ||||||||||
| Subdivision Type1: | Country | ||||||||||
| Subdivision Name1: | Mongolia | ||||||||||
| Subdivision Type2: | Aimags | ||||||||||
| Subdivision Name2: | Zavkhan, Khövsgöl | ||||||||||
| Length: | 452km (281miles) | ||||||||||
| Discharge1 Avg: | 57m3/s | ||||||||||
| Source1 Location: | Khangai Mountains | ||||||||||
| Source1 Coordinates: | 47.9131°N 97.9503°W (approximately) | ||||||||||
| Source1 Elevation: | 2850 m (approximately) | ||||||||||
| Mouth: | Selenge | ||||||||||
| Mouth Location: | Olon golyn bilchir | ||||||||||
| Mouth Coordinates: | 49.2611°N 100.6792°W | ||||||||||
| Basin Size: | 24555km2 | ||||||||||
| Tributaries Right: | Chuluut River | ||||||||||
| Extra: |
| ||||||||||
The Ider River (mn|Идэр гол,, or Mongolian: Идэрийн гол,, "Young River") is a river in the Khövsgöl and Zavkhan aimags in northwestern Mongolia and is, together with the Delger mörön river, one of the sources of the Selenga river. It is long, and has a drainage basin of .[1] The source is in the Khangai range, the confluence with the Delgermörön is in Tömörbulag. The river is frozen 170–180 nights per year. There is a wooden bridge, which was built in 1940, near Jargalant and a concrete bridge in Galt.