The Sankh River flows across Jharkhand, Chhattisgarh and Odisha states in India. The river flows for a distance of 240 km before it meets the Koel River in Odisha.
The river starts 1000 m above sea level in Lupungpat village in Gumla district in Jharkhand and flows 67.5 km in the state before entering Chhattisgarh. It runs a distance of about 50 km in Chhattisgarh and enters Jharkhand again to flow for another 78 km. The river finally enters Oisha and travels a distance of 45 km before merging with the Koel. The South Koel enters Orissa and joins the Sankh River at Vedavyas near Rourkela from where it is called the Brahmani (see 22°14′45″N 84°47′02″E / 22.2458800°N 84.7837500°E).
The 60 metres (200 ft) high Sadni Falls on the Sankh River at the edge of the Ranchi plateau is an example of scarp falls or knick line falls.