Chaya (Ob)The Chaya is a left tributary of the Ob river in Russia. The river is long and has a catchment area of.CourseThe Chaya is formed by the confluence of the long Parbig and the long Bakchar rivers. It flows in a roughly northern or northeastern direction along its course. Finally it meets the left bank of the Ob from the Ob's mouth. The basin of the river is located in the Chainsky and Kolpashevsky districts of Tomsk Oblast.TributariesThe main tributaries of the Chaya are the long Nyursa on the left, as well as the long Iksa on the right.