| Mandekal Aru | |
| River | |
| Country | Sri Lanka |
|---|---|
| State | Northern Province |
| District | Mullaitivu District Kilinochchi District |
| Source | Mullaitivu District |
| Mouth | Palk Bay |
| - elevation | 0 m (0 ft) |
| Length | 30 km (19 mi) |
| Basin | 297 km2 (115 sq mi) |
Mandekal Aru is a river in Northern Province, Sri Lanka. The river rises in western Mullaitivu District, before flowing north through Mullaitivu District and Kilinochchi District. The river empties into Palk Bay.
Coordinates: 9°27′N 80°09′E / 9.450°N 80.150°E