[2] The Mamsko-Chuysky District of Irkutsk Oblast is named after rivers Mama and Chuya.

[5] The main fish species in the river are dace, lenok, whitefish, grayling and taimen.

It has its sources in a small mountain lake of the Synnyr Massif of the North Baikal Highlands and flows in a roughly NNE direction across the highland area within the North Baikal District of Buryatia.

As it flows roughly northwards past the confluence of its Tukulakh tributary there is a long, tumultuous stretch with rapids and cascades.

Downstream from the Gorno-Chuysky ghost town zone the river proceeds along a narrow valley with riffles in the current.