| Yan Oya | |
| Pushpin Map: | Sri Lanka |
| Length: | 142km (88miles) |
| Discharge1 Max: | 412 106Sq.m |
| Source1 Location: | Ritigala |
| Mouth Location: | Pulmoddai |
| Mouth Elevation: | Sea level |
The Yan Oya is the fifth-longest river of Sri Lanka. The 1420NaN0 long river's catchment area receives approximately 2,371 million cubic metres of rain per year, and approximately 17 percent of the water reaches the sea. The Yan Oya has a catchment area of 1,520 square kilometres.[1]