|- location||Central Province|
|- elevation||2,000 m (6,600 ft)|
|1,200 m (3,937 ft)|
|Length||27 km (17 mi)|
Nanu Oya is a 27 km (17 mi) long stream in the Central Province of Sri Lanka It originates from Pidurutalagala at an elevation of over 2,000 m (6,562 ft) and drains into the Kotmale Oya at an elevation of approximately 1,200 m (3,937 ft). 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. The Nanu Oya discharges into the Kotmale Oya 2.5 km (1.6 mi) upstream of the Upper Kotmale Dam.
- Wijesinghe, Pushpitha (16 April 2012). "Gregory Lake". WellKnownPlaces.com. Retrieved 2 January 2016.
- Siriwardena, Wasantha (2 January 2012). "'Waterfall Tour' offers spectacular sights in and around scenic Nuwara Eliya region". The Island. Retrieved 2 January 2016.
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