The Barro Duro River is a river of Maranhão state in northeastern Brazil.
| Barro Duro River | |
|---|---|
| Location | |
| Country | Brazil |
| Physical characteristics | |
| Source | |
| • location | Maranhão state |
| Mouth | Atlantic Ocean |
• coordinates | 2°51′S 42°15′W / 2.850°S 42.250°W |
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