The Dhasan River is a right bank tributary of the Betwa River. The river originates in Begumganj tehsil of Raisen district in Madhya Pradesh state in central India. The river forms the southeastern boundary of the Lalitpur District of Uttar Pradesh state. Total length of the river is 365 km, out of which 240 km lies in Madhya Pradesh, 54 km common boundary between Madhya Pradesh and Uttar Pradesh and 71 km in Uttar Pradesh. The river was known as the Dasharna in ancient period. The Lehchura Dam is built on this river at 10 km from Harpalpur railway station. Residents of nearby villages regard this river as a holy river.

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Coordinates: 25°48′N 79°24′E / 25.800°N 79.400°E / 25.800; 79.400