Do Sono River (Tocantins)

The Do Sono River (Rio do Sono) is a river of Tocantins state in central Brazil. It is a right tributary of the Tocantins River.

The river has its headwater in the 158885 ha Jalapão State Park, a fully protected conservation unit created in 2001. It forms where the Novo and Soninho meet on the northwest boundary of the state park.