|• location||Confluence of Irgichyan and Baky|
|• elevation||169 metres (554 ft)|
|23 metres (75 ft)|
|Length||586 km (364 mi)|
|Basin size||177,000 km2 (68,000 sq mi)|
|Progression||Indigirka→ East Siberian Sea|
The river is formed by the confluence of the 211 kilometres (131 mi) long Irgichyan originating in the NW Selennyakh Range and the 170 kilometres (110 mi) 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. The river flows then through the Aby Lowland. The length of the Uyandina is 586 kilometres (364 mi). The area of its drainage basin is 177,000 square kilometres (68,000 sq mi).
The Uyandina freezes up in October and remains icebound until late May or early June.
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