The Rihand Dam has been constructed on the tributary of the Sone River. This means that the dam is located on a smaller river that flows into the Sone River. The Sone River itself is a major river in central India, flowing through the states of Madhya Pradesh, Chhattisgarh, Jharkhand, Bihar, and Uttar Pradesh. The Rihand Dam, also known as the Govind Ballabh Pant Sagar, is a concrete gravity dam located in the Sonbhadra district of Uttar Pradesh. It was built across the Rihand River, which is a tributary of the Sone River. The dam serves multiple purposes, including irrigation, hydroelectric power generation, and flood control.