Description : Madu Ganga is a minor watercourse which originates near Uragasmanhandiya in the Galle District of Sri Lanka, before widening into the Madu Ganga Lake at Balapitiya. The river then flows for a further a 4.4 km before draining into the Indian Ocean. It is located 88 km south of Colombo and 35 km north of Galle. A mangrove lagoon joined to the sea by a narrow canal and containing 15 islands of varying size, some of which are inhabited. Sri Lanka.