The stream flows for 16 km down its valley before joining the Kelani Ganga near Hanwella.
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Starting from the hills in Puswelihena in Horana Division of Kalutara District, it flows northwards through a low lying flat land (6–10 meters above sea level) converted into rice fields, which ultimately becomes the stream's flood plain during rainy seasons.
Oya | Nanu Oya | Tsubasa Oya | Oya Eczacıbaşı | Diyawanna Oya |