The Rio Grande ou Jurubatuba flows through the Atlantic Forest region of São Paulo State, Brazil, forming part of the broader Cubatão River drainage system. This river system sits within a biologically rich coastal environment where freshwater streams descend from elevated terrain toward the estuarine zones near Santos and the surrounding coastal lowlands. The river is notable for its ecological diversity, supporting a remarkable assemblage of fish species characteristic of Atlantic Forest stream systems, and it offers anglers access to both freshwater and estuarine species depending on where along the system they fish.