|Length||500 km (310 mi)|
The river has a total length of 375 kilometres (233 mi). It originates in several streams east of the Cordillera Oriental of the Peruvian Andes. The river is navigable for circa 320 kilometres (200 mi) in its lower northeastern part. At Manoa it joins the Río Madeira, a tributary of the Amazon. Opposite the river mouth there is the town of Abunã on the Brazilian side of the confluence.