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Kalu Ganga (Sinhala: කළු ගඟ; literally: The Black River) is 129 km (80 miles) in length and originates from Adam's Peak. Itreaches the sea at Kalutara. The Black River flows through the Ratnapura and the Kalutara districts and passes the city of Ratnapura. The mountainous forests in the Central Province and the Sinharaja Forest Reserve are the main sources of water for the river