title: Coco River (Araguaia River tributary)
text: # Coco River (Araguaia River tributary)
  
  The Coco River (Portuguese: Rio do Coco) is a river of Tocantins state in central Brazil. It is a tributary of the Araguaia River.
  
  ## Lower course
  
  The lower portion of the Coco River forms the eastern boundary of the Cantão State Park, and the western boundary of the Ilha do Bananal/Cantão Environmental Protection Area. This section was probably originally a meander of the Javaés River, in turn a branch of the Araguaia. The frequently flooded Cantão region between the Coco and Araguaia rivers holds an ecotone between the Amazon and Cerrado biomes.
  
  