The famous multi-purpose river valley project constructed across the Mahanadi River in Odisha, which is one of the world's longest earthen dams, is known as:

💡 Solution & Explanation

The Hirakud Dam is built across the Mahanadi River about fifteen kilometers upstream of Sambalpur in Odisha, forming a massive artificial reservoir and ranking among the longest earth-fill dams globally. The Bhadra and Tungabhadra dams are major irrigation projects located in Karnataka across tributaries of the Krishna river system. Nagarjuna Sagar Dam is constructed across the Krishna River on the boundary between Telangana and Andhra Pradesh. Hirakud was among the earliest major river valley development projects undertaken in independent India.