- The Walawe River basin, located in the southeast, has an area of 2,500 km2 and covers 4% of the total landmass of the Sri Lanka, it is one of the nation’s biggest basins.
- Recent water resources development has linked some adjacent small river basins to the Walawe basin. Thus, the total area covered in this study is 3,300 km2 and includes the Malala Oya, Kachchigal Oya and Karagan Oya. Read more
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