| Uyandina | |
| Other Name: | Уяндина / Уйаандьы |
| Source1 Location: | Confluence of Irgichyan and Baky |
| Mouth: | Indigirka |
| Mouth Coordinates: | 68.4042°N 145.8322°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 586km (364miles) |
| Basin Size: | 177000km2 |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Mouth location in Yakutia, Russia |
The Uyandina (Russian: Уяндина; Yakut: Уйаандьы|translit=Uyaancı) is a river in Yakutia, Russia, a tributary of the Indigirka. The length of the Uyandina is 586km (364miles). The area of its drainage basin is 177000km2.
The river is formed by the confluence of the long Irgichyan originating in the NW Selennyakh Range and the long Baky, which has its source in Lake Baky, located at the junction of the western end of the Polousny Range and the Kyun-Tas.[1] After flowing in a roughly southern direction in its upper course, the Uyandina flows then eastwards through the Aby Lowland. Finally it meets the left bank of the Indigirka 599km (372miles) from its mouth.[2] [3]
The Uyandina freezes up in October and remains icebound until late May or early June.
The biggest tributaries of the Uyandina are the 444km (276miles) long Khatyngnakh and 290km (180miles) long Khachimcher from the left, as well as the 213km (132miles) long Buor-Yuryakh from the right.
