| Mahaweli (Mahaweli Ganga) | |
| River | |
|
Mahaweli River flowing through Gampola
|
|
| Country | Sri Lanka |
|---|---|
| Source | Central Province |
| Mouth | Bay of Bengal |
| - location | Trincomalee |
| - elevation | 0 m (0 ft) |
| Length | 335 km (208 mi) |
The Mahaweli River (Sinhala: මහවැලි ගඟ, literally "Great Sandy River"; Tamil: மகாவலி ஆறு [mahawali gangai]),[1] is a 335 km (208 mi) long river, ranking as the longest river in Sri Lanka. Its drainage basin is the largest in the country, and covers almost one-fifth of the total area of the island. The river reaches the Bay of Bengal on the southwestern side of Trincomalee Bay. The bay includes the first of a number submarine canyons, making Trincomalee one of the finest deep-sea harbors in the world.[2] The river and its tributaries are dammed at several locations to allow irrigation in the dry zone, with almost 1,000 km2 (386 sq mi) of land irrigated.[3] Production of hydroelectricity from six dams of the Mahaweli system supplies more than 40% of Sri Lanka's electricity needs. One of the many sources of the river is the Kotmale Oya.[4]