Hirakud Dam is built across the Mahanadi River, about 10 kilometres (6.2 mi) from Sambalpur in the state of Odisha in India. It is the longest earthen dam in the world. Behind the dam extends a lake, Hirakud Reservoir, 55 km (34 mi) long. It is one of the first major multipurpose river valley projects started after India's independence@khangsresearchcentre1685 @StudyIQEducationLtd @DrishtiIASvideos @unacademyupscprep @RaviStudyGkOfficial
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