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The Deduru Oya is the sixth-longest river of Sri Lanka. The 142 km (88 mi) long river runs across four provinces and five districts.
Tributaries
Kospothu Oya
Dik Oya
Ratwila Ela
Kimbulwana Oya
Hakwatuna Oya
Maguru Oya
Kolamunu Oya
Delvita Oya
Its catchment area receives approximately 4,313 million cubic metres of rain per year, and approximately 27 percent of the water reaches the sea. It has a catchment area of 2,620 square kilometres.