Udya

The Udya or Udzha (Удя or Уджа; Удьаа, Ucaa) is a river in Yakutia (Sakha Republic), Russia. It is a right tributary of the Anabar with a length of 342 km. Its drainage basin area is 15700 km2.

The river flows north of the Arctic Circle, in the northern limits of the Central Siberian Plateau and the North Siberian Lowland. The area is lonely and desolate, devoid of settlements. The Beyenchime-Udzha interfluve is an area where diamonds are found.

Course
The Udya is the third largest tributary of the Anabar. Its sources are in the vicinity of the sources of the Bur, Buolkalakh and the Beyenchime of the Olenyok basin. It is formed at the confluence of rivers Tokur-Udya and Mas-Udya in an area of lakes. It heads roughly northwestwards all along its course. Finally it joins the right bank of the Anabar 242 km from its mouth. The confluence is not far upstream from Saskylakh.

The river is fed by rain and snow. It is frozen between early October and late May / early June. The longest tributaries are the 129 km long Chyuyompe-Yurege (Чюёмпэ-Юрэгэ) and the 104 km long Udyakan (Удьакан) from the right, as well as the 168 km long Chymaara (Чымаара) from the left.

Fauna
The Udya river is rich in fish species, including broad whitefish, humpback whitefish and peled, among others.