The Deduru Oya (Tamil: மாயவன் ஆறு) is the sixth-longest river of Sri Lanka. The 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.
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