Selennyakh (river) — The Selennyakh (Russian: Селеннях; Yakut: Силээннээх, romanized: Sileenneex) is a river in the Sakha Republic (Yakutia), Russia. It is a left tributary of the Indigirka River.
Geography and Course
The river has a length of 796 kilometres (495 mi) and a drainage basin area of 30,800 square kilometres (11,900 sq mi). It originates at the confluence of the Kharga-Salaa and Nyamnya rivers in the northwestern spurs of the Chersky Range, at an elevation of 420 metres (1,380 ft). The river flows southeastwards through the Moma-Selennyakh Depression, a wide intermontane basin bounded by the Burkat and Khadaranya ranges to the west and the Selennyakh Range to the east. In its middle course, the Selennyakh makes a wide bend northeastwards and then flows across the Aby Lowland in a roughly eastern direction until it reaches the left bank of the Indigirka River. Its mouth lies at an elevation of 29 metres (95 ft).
Hydrology
The Selennyakh is frozen between October and May. The average annual discharge at the mouth is 180 cubic metres per second (6,400 cu ft/s). According to the State Water Register of Russia, it is part of the Lena basin district.
Settlements
Sayylyk, located in the Ust-Yansky District, is the only inhabited place within the river's basin.
Tributaries
The river is formed by the confluence of the Kharga-Salaa and Nyamnya rivers at its source.
