| Soninho River Rio Soninho | |
|---|---|
  | |
| Location | |
| Country | Brazil |
| Physical characteristics | |
| Source | |
| • location | Mateiros, Tocantins |
| • coordinates | 10°13′40″S 46°36′31″W / 10.227830°S 46.608604°W |
| Mouth | |
• location | Do Sono River |
• coordinates | 10°10′55″S 46°56′08″W / 10.181875°S 46.935478°W |
| Basin features | |
| River system | Do Sono River |
The Soninho River (Portuguese: Rio Soninho) is a river of Tocantins state, Brazil. It is a headwater of the Do Sono River.
The Soninho river forms on the northeast boundary of the 158,885 hectares (392,610 acres) Jalapão State Park, a fully protected conservation unit created in 2001.[1] It runs west along the north boundary of the park to the point where it meets the Novo River from the right to form the Do Sono River.