Kochechum River

Kochechum (Кочечум)
River
City	Tura
Source
- location	Central Siberian Plateau, Russia
Mouth	Nizhnyaya Tunguska
- elevation	125 m (410 ft)
Length	733 km (455 mi)
Basin	96,400 km2 (37,220 sq mi)
Discharge	for Nizhnyaya Tunguska
- average	600 m3/s (21,189 cu ft/s)
Map in Russian of the Nizhnyaya Tunguska basin with Kochechum river joining it from the north near locality Tura.

Coordinates: 64°17′00″N 100°13′00″E / 64.28333°N 100.21667°E / 64.28333; 100.21667

The Kochechum (Russian: Кочечум) is a river in Siberia, Russia, it flows through the Krasnoyarsk Krai. It is right and most significant inflow of the Nizhnyaya Tunguska river.

The river is 733 kilometres (455 mi) long, and its watershed covers 96,400 square kilometres (37,200 sq mi). The average discharge at the mouth is 600 cubic metres per second (21,000 cu ft/s). The part of its basin near the source lies on the southern slopes of Putorana Plateau. It flows to the south direction through Syverma Plateau and joins Nizhnyaya Tunguska near the town Tura. The primary tributaries of Kochechum are Embenchime, Tembenchi and Turu.

The confluence of Kochechum and Nizhnyaya Tunguska corresponds to the farthest point of fairway section upstream off the Yenisei river.

The basin of the river entirely belongs to the zone of continental subarctic climate. Winter period starts in October and ends in May, during calendar winter temperatures can plummet below −60 °C (−76 °F). Due to average temperatures below freezing in this area, its watershed belongs to the region of continuous permafrost with a frozen layer that varies in depth between 50 and 200 metres (160 and 660 ft). The permafrost effectively blocks any underground supply; all water flowing through the river comes from snow and rain. The river stays ice-bound from October to May or June every year.