| Plaiu River | |
| Laposnyak-patak, Lăpuşnic River | |
| River | |
| Countries | Romania |
|---|---|
| Region | Transylvania |
| Counties | Hunedoara County |
| Villages | Stânceşti, Răduleşti, Lăpuşnic |
| Source | |
| - location | Poiana Rusca Mountains |
| Mouth | Mureş River |
| - location | Lăpuşnic |
The Plaiu River or Lăpuşnic River ( Hungarian: Laposnyak-patak ) is a tributary of the Mureş River in Transylvania, Romania.