Hirakud Dam is built across which river?

The Hirakud Dam is constructed across the Mahanadi River in the state of Odisha. Located about 15 km from Sambalpur, it is a landmark project as it was the first major multipurpose river valley project started after India's independence. It is one of the longest earthen dams in the world, with the main dam stretching 4.8 km and the entire structure extending over 25 km. The project serves multiple purposes, primarily flood control in the Mahanadi delta, irrigation, and hydroelectric power generation. The reservoir created by the dam, known as the Hirakud Reservoir, is also recognized as a Ramsar site due to its ecological significance as a wetland. Other rivers mentioned, like the Kaveri, Krishna, and Godavari, host other major dams such as the Mettur, Almatti/Srisailam, and Dowleswaram Barrage respectively.