| Piau River | |
|---|---|
| Location | |
| Country | Brazil |
| Physical characteristics | |
| Source | |
| • location | Bahia state |
| Mouth | Una River |
• coordinates | 13°22′S 39°10′W / 13.367°S 39.167°W / -13.367; -39.167 |
The Piau River is a river of Bahia state in eastern Brazil. It is a tributary of the Una River.