| Piramenthal Aru | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Sri Lanka |
| Subdivision Type2: | Province |
| Subdivision Name2: | Northern Province |
| Subdivision Type3: | Districts |
| Subdivision Name3: | Mullaitivu, Kilinochchi |
| Length: | 20km (10miles) |
| Source1 Location: | Mullaitivu District |
| Mouth: | Chundikkulam Lagoon |
| Mouth Location: | Kilinochchi District |
| Basin Size: | 82km2 |
The Piramenthal is a small river in Northern Province, Sri Lanka. The river rises in northern Mullaitivu District, and flow north through the Mullaitivu and Kilinochchi districts. The river empties into Chundikkulam Lagoon.[1]