An Image of the longest Sri Lankan River - Mahaweli | Rank / Name | Length(km) |
| 1 Mahaweli River | 335 |
| 2 Malvathu River | 164 |
| 3 Kala Oya | 148 |
| 4 Kelani River | 145 |
| 5 Yan Oya | 142 |
| 6 Deduru Oya | 142 |
| 7 Walawe Ganga | 138 |
| 8 Maduru Oya | 135 |
| 9 Maha Oya | 134 |
| 10 Kalu River | 129 |
| 11 Kirindi Oya | 117 |
| 12 Kumbukkan Oya | 116 |
| 13 Menik Oya | 114 |
| 14 Gin River | 113 |
| 15 Mi Oya | 109 |
| 16 Gal Oya | 108 |
