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Nanu Oya is a long stream in the Central Province of Sri Lanka It originates from 
Pidurutalagala
Pidurutalagala ( si, පිදුරුතලාගල, pronounced , ''Straw Plateau Rock''), or Mount Pedro in English, is an ultra prominent peak and the tallest mountain in Sri Lanka, at . It is situated North-North-East from the town of Nuwa ...
at an elevation of over and drains into the Kotmale Oya
The Kotmale River ( si, කොත්මලේ ඔය ) is the longest tributary of Mahaweli River. The river begins as the Agra Oya, in the Horton Plains. The Central Plains have an annual rainfall of between 125 and 200 inches a year. The river ...
at an elevation of approximately . The Kotmale Oya is a tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drai ...
of the Mahaweli River
The Mahaweli River ( si, මහවැලි ගඟ, literally "Great Sandy River"; ta, மகாவலி ஆறு 'mahawali gangai'', is a long river, ranking as the longest river in Sri Lanka. It has a drainage basin of , the largest in the ...
, the longest river in Sri Lanka, which finally discharges at Trincomalee
Trincomalee (; ta, திருகோணமலை, translit=Tirukōṇamalai; si, ත්රිකුණාමළය, translit= Trikuṇāmaḷaya), also known as Gokanna and Gokarna, is the administrative headquarters of the Trincomalee Dis ...
after a combined distance of nearly . The river was dammed in 1873 to create the popular Lake Gregory in Nuwara Eliya
Nuwara Eliya ( si, නුවර එළිය ; ta, நுவரெலியா) is a city in the hill country of the Central Province, Sri Lanka. Its name means "city on the plain (table land)" or "city of light". The city is the administrativ ...
. The Nanu Oya discharges into the Kotmale Oya upstream of the Upper Kotmale Dam
The Upper Kotmale Dam (also known as the Upper Kotmale Hydropower Project, or UKHP) is located in Talawakele, within the Nuwara Eliya District, in the Central Province of Sri Lanka. The dam feeds the third largest hydroelectric power station ...
.
See also
*Nanu Oya (town)
Nanu Oya is a village in Sri Lanka, named after the Nanu Oya river. It is located within Nuwara Eliya District in the Central Province and is situated approximately away from Nuwara Eliya
Nuwara Eliya ( si, නුවර එළිය ; t ...
* List of dams and reservoirs in Sri Lanka
The following page lists most dams in Sri Lanka. Most of these dams are governed by the Mahaweli Authority, while the Ceylon Electricity Board operates dams used for hydroelectric power generation. Hydroelectric dams, including small hydros acco ...
* List of rivers of Sri Lanka
References
Rivers of Sri Lanka Geography of Nuwara Eliya District {{NuwaraEliyaDistrict-geo-stub