Basin of the Yana.
|⁃ location||Chersky Range|
|⁃ elevation||1,900 m (6,200 ft)|
|Confluence with the Yana River|
|108 m (354 ft)|
|Length||715 km (444 mi)|
|Basin size||89,800 km2 (34,700 sq mi)|
|⁃ average||512 m3/s (18,100 cu ft/s)|
The Adycha River (Russian: Адыча; Yakut: Адыаччы) is a river in the Republic of Sakha in Russia. It is a right hand tributary of the Yana, and is 715 kilometres (444 mi) long, with a drainage basin of 89,800 square kilometres (34,700 sq mi).
At the end of the Soviet period, a big dam with a hydroelectric station was planned to be built on the river, but following perestroika and economic difficulties in the country the project was given up.
The river begins in the western flank of the Chersky Range at an elevation of 1,900 metres (6,200 ft). It heads roughly north and northwest across a wide river valley where taiga and forest tundra predominate. Finally, after flowing across the western end of the Kisilyakh Range, it joins river Yana from the right about 30 kilometres (19 mi) to the north of Batagay. The river is also known as "Borong" (Russian: Боронг) in a section of its upper course.
The main tributaries of the Adycha are Delakag (Делакаг), Charky (Чаркы) and Tuostakh (Туостах) on the right; and Derbeke (Дербеке), Nelgese (Нельгесе) and Borulakh (Борулах) on the left.
River Adycha freezes in October and is under thick ice until the end of May. For about 4½ months it is frozen to the bottom. Part of the river is navigable after the thaw.
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