Kalu Ganga (; literally: Black River) is a river in Sri Lanka. The river originates from Sri Pada Peak Wilderness Sanctuary, reaching the sea at Kalutara after a journey. The Black River flows through the Ratnapura and the Kalutara District and passes the city Ratnapura. The mountainous forests in the Central Province and the Sinharaja Forest Reserve are the main sources of water for the river. Development of a Flood Forecasting Model For Kalu River and Kelani River Basins in Sri Lanka using Radial Basis Function Neural Networks The Edwardian manor, Richmond Castle is on the banks of the river near Kalutara.
See also List of rivers in Sri Lanka
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