Rio Negro (Portuguese for "black river") is a river of Tocantins state in central Brazil.
| Rio Negro | |
|---|---|
 | |
| Location | |
| Country | Brazil |
| Physical characteristics | |
| Source | |
| • location | Tocantins state |
| Mouth | Perdida River |
• coordinates | 9°19′10″S 47°43′26″W / 9.31948°S 47.72378°W |