The river is a left tributary of the Angara, which flows into the Bratsk Reservoir. It is formed at the confluence of the Bolshaya Belaya (Big Belaya)[2] and Malaya Belaya (Little Belaya). Its length is 359 kilometres (223 mi) from the source of Bolshaya Belaya in the Belskye Goltsy of the Eastern Sayan. Not including the latter the length is 79 kilometres (49 mi).[3]
Besides the Malaya Belaya, the main tributary is the Urik. There are about 400 lakes in the basin. The Belaya freezes up in October or November and stays under ice until April or May.[3]