| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Kehelgamu Oya |  | Kelani River | 50,000 | 6.9827777778 | 80.4500000000 | Map | |||||
| Maskeliya Oya |  | Kelani River | 40,000 | 6.7722200000 | 80.6222000000 | Map |