| Kala Oya | |
| Pushpin Map: | Sri Lanka |
| Length: | 148km (92miles) |
| Source1 Location: | Dambulla |
| Mouth: | Palk Strait |
| Mouth Location: | Wilpattu |
| Mouth Elevation: | Sea level |
| Basin Size: | 2873km2 |
The Kala Oya is the third longest river in Sri Lanka. The 1450NaN0 long river has a basin size of 2873km2,[1] and more than 400,000 rural population live by the river basin.[2]
Its catchment area receives approximately 3,169 million cubic metres of rain per year, and approximately 5 percent of the water reaches the sea. It has a catchment area of 1,792 square kilometers.[3]