Malwathu Oya
The Malwathu Oya is the second longest river in Sri Lanka. The river originates in the North Central Province of Sri Lanka and enters the sea on the northwest coast, into the Gulf of Mannar, [Sri Lanka|Mannar], near Vankalai. It is a seasonal river that spans over through paddy and forest lands, which are used by the inhabitants to cultivate for their survival.
The river basin covers an area of . The average annual rainfall in the basin area is. The Ritigala mountain range, which comprises four main peaks, in the upper reaches of the river, serves as the main catchment.
Tributaries
- Kanadara Oya
- Maminiya Oya
- Kadahatu Oya
- Kal Aru
- Narivili Aru