Nanu Oya is a 27 km (17 mi) long stream in the Central Province of Sri Lanka.

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 350 km (217 mi).

The river was dammed in 1873 to create the popular Lake Gregory in Nuwara Eliya.

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