| Adycha | |
| Source1 Location: | Chersky Range |
| Source1 Coordinates: | 65.5933°N 140.1839°W |
| Mouth: | Yana |
| Mouth Coordinates: | 68.2132°N 134.7703°W |
| Subdivision Type1: | Country |
| Length Km: | 715 |
| Source1 Elevation: | 1900m (6,200feet) |
| Mouth Elevation: | 108m (354feet) |
| Discharge1 Avg: | 512m3/s |
| Basin Size Km2: | 89800 |
The Adycha (ru|Адыча; sah|Адыаччы, Adıaccı) is a river in the Republic of Sakha in Russia. It is a right hand tributary of the Yana, and is 715km (444miles) long, with a drainage basin of 89800km2.[1]
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 1900m (6,200feet). It heads first westwards and then roughly northwestwards, flanking the western side of the Nendelgin Range across a wide river valley. After bending around the northern end of the Tirekhtyakh Range it heads northwards and meanders strongly.[2] Finally, after flowing across the western end of the Kisilyakh Range, it joins river Yana from the right about 30km (20miles) to the north of Batagay and roughly 30km (20miles) to the south of the confluence with the Oldzho. The river is also known as "Borong" (Russian: Боронг) in a section of its upper course.[3]
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.
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.
Taiga and forest tundra predominate in the valley of the river.
