The following is a list of rivers in Sri Lanka. Rivers shorter than 100 km (62 mi) are not included in this list.
The Mahaweli River.
The Gin River.
More information Rank, Name ...
| Rank | Name | Source | Destination | Length |
| 1 | Mahaweli River | Hortin plain | Trincomalee | 335 km (208 mi) |
| 2 | Malvathu River | Anuradhapura | Mannar | 164 km (102 mi) |
| 3 | Kala Oya | | | 148 km (92 mi) |
| 4 | Kelani River | Adam's Peak | Colombo | 145 km (90 mi) |
| 5 | Yan Oya | | | 142 km (88 mi) |
| 6 | Deduru Oya | | | 142 km (88 mi) |
| 7 | Walawe Ganga | Adam's Peak | | 138 km (86 mi) |
| 8 | Maduru Oya | | | 135 km (84 mi) |
| 9 | Maha Oya | | | 134 km (83 mi) |
| 10 | Kalu River | Adam's Peak | Kalutara | 129 km (80 mi) |
| 11 | Kirindi Oya | | | 117 km (73 mi) |
| 12 | Kumbukkan Oya | | | 116 km (72 mi) |
| 13 | Menik Oya | | | 114 km (71 mi) |
| 14 | Gin River | Deniyaya | Galle | 113 km (70 mi) |
| 15 | Mi Oya | | | 109 km (68 mi) |
| 16 | Gal Oya | | | 108 km (67 mi) |
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