Mahaweli River in Sri Lanka

Mahaweli Ganga,  ( Sandy River"), stream, focal and eastern Sri Lanka. At 208 mi (335 km) long, it is Sri Lanka's longest stream. It climbs on the Hatton Plateau on the western side of the island's mound nation, streams north through a tea- and elastic developing area, and turns east close Kandy; it then turns north over the marshes, gets its chief tributary, the Amban Ganga, and streams past Polonnaruwa to its mouth on Koddiyar Bay, 7 miles south of Trincomale