The Palcazu River is a river in Peru which forms from the confluence of the Bocaz and Cacazú rivers, who are born in the mountains of the mountain range of San Carlos.
The Palcazú has a length of 182 km, draining an area of 3337 km² and a flow of 2892.5 m³/s. It belongs to the rivers of longitudinal type, that is to say that passes parallel to the structure of the rocks. Its breadth reaches a maximum of 300 m.