Hasdeo River, a major tributary of the Mahanadi, is one of the important rivers of Chhattisgarh. It flows towards south of the state, through Koriya, Bilaspur and Korba Districts. During its course, this river merges with its tributaries such as
Gej and the Chornai on the left bank and the Tan and the Ahiran on the right before it meets the Mahanadi .Hasdeo has a total length of 245 km and has its origin in Mendra village. Other tributaries of Hasdeo include Jhumka and Bania. Along the river lie rocks and hilly areas, thin forest areas and important settlements such as Sonhat, Ghugra, Manendragarh, Kosgain, Korba and Champa.