Hasdeo River is the largest tributary of Mahanadi River. The river flows in the state of Chhattisgarh. It joins Mahanadi River near Shiladehi (Birra). Hasdeo Bango Dam is constructed across this river. The river originates about 910.0 m (2,985.6 feet) above sea level, in a place about 10.0 km (6.2 miles) from Sonhat in Koriya district. The total length of the river is 333.0 km (206.9 miles), and drainage area is 9856 km². The major tributary of Hasdeo River is Gej River.^[1] The river flows through the Hasdeo Arand forest.^[2]

River Hasdeo
Location
Country	India
State	Chhattisgarh
District	Manendragarh Koriya Korba Janjgir–Champa
City	Manendragarh Korba Champa
Physical characteristics
Source	Kaimur Hill (Devgarh pahadi)
• location	Sonhat, Manendragarh, Chhattisgarh, India
Mouth	Shiladehi (Birra)
• location	Janjgir–Champa, Chhattisgarh, India
Length	176 km (109 mi)
Basin features
Tributaries
• left	Ahiran River, Tan River