The river forms to the north of Santo Antônio da Alegria, just north of the BR-265 highway near the border with Minas Gerais, where the Ribeirão do Pinheirinho meets the Ribeirão Tomba-perna.

It then flows in a generally northwest direction.

The river is dammed twice near São Joaquim da Barra.

It continues northwest and enters the Rio Grande upstream from Colômbia, São Paulo.

This article related to a river in the state of São Paulo is a stub.