The Brahmani is a major seasonal river in the Odisha state of Eastern India. The Brahmani is formed by the confluence of the Sankh and South Koel rivers, and flows through the districts of Sundargarh, Kendujhar, Dhenkanal, Cuttack and Jajapur. Together with the rivers Mahanadi and Baitarani, it forms a large delta before entering into the Bay of Bengal at Dhamra.
The Brahmani is formed by the confluence of the rivers South Koel and Sankh near the major industrial town of Raurkela at 22 15′ N and 84 47′ E. The Sankh has its origins near the Jharkhand-Chhatisgarh border, not far from the Netarhat Plateau. The South Koel too arises in Jharkhand, near Lohardaga, on the other side of a watershed that also gives rise to the Damodar River. Both of these sources are in the Chota Nagpur Plateau. At about 480 km long, the Brahmani is the second longest river in Orissa after the Mahanadi. However if its constituent rivers are included its length extends to about 799 km, 541 of which is in Orissa. It has a catchment area of about 39,033 km2 in Orissa alone.