Hasdeo River is the largest tributary of the Mahanadi River. The river flows in the state of Chhattisgarh. It joins the Mahanadi River near Shiladehi(Birra), a village in Janjgir-Champa district. Minimata Dam, which is commonly known as Hasdeo Bango Dam, is constructed across this river near Bango village. The river originates about above sea level, in a place about from Sonhat in Koriya district. The total length of the river is , and drainage area is 9856 km<sup>2</sup>. The major tributary of Hasdeo River is Gej River and other tributary rivers are the Taan, Ooteng, Chornai, and Jhing. The river flows through the Hasdeo Arand forest.
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