Nanu Oya

Nanu Oya is a long stream in the Central Province of Sri Lanka It originates from Pidurutalagala at an elevation of over and drains into the Kotmale Oya at an elevation of approximately . The Kotmale Oya is a tributary of the Mahaweli River, the longest river in Sri Lanka, which finally discharges at Trincomalee after a combined distance of nearly . The river was dammed in 1873 to create the popular Lake Gregory in Nuwara Eliya. The Nanu Oya discharges into the Kotmale Oya upstream of the Upper Kotmale Dam.