The Chuya (Russian: Чуя), also known as Big Chuya (Russian: Большая Чуя, romanized: Bolshaya Chuya) in its last 52 km stretch, is a river in Buryatia and Irkutsk Oblast, Russia. It is the 13th longest tributary of the Lena and the 191st longest river in Russia, with a length of 512 kilometres and a drainage basin area of 18,400 square kilometres.
The Mamsko-Chuysky District of Irkutsk Oblast is named after rivers Mama and Chuya. The abolished district\’s settlement of Chuya is located on the right bank of the Lena River at the confluence with the Chuya.
