The Chechuy (Russian: Чечуй) is a river in Irkutsk Oblast, Russia.

[2] Between 1909 and 1911 the North Baikal Highlands were explored by Russian geologist Pavel Preobrazhensky (1874 - 1944).

He surveyed the river valleys of the area, all of them tributaries of the Lena basin, including the Chechuy.

Approximately in mid course, the river turns to the NNE and flows roughly in that direction until it reaches the Lena.

[4][2] The largest tributaries of the Chechuy are the 117 kilometres (73 mi) long Lower Rassokha (Нижняя Рассоха) and the 81 kilometres (50 mi) long Middle Rassokha (Средняя Рассоха) that join it from the right.