Rio Japaratuba is a river flowing through the state of Sergipe in northeastern Brazil, emptying into the Atlantic Ocean near Barra dos Coqueiros. The river is notable for its estuarine zone, where freshwater mixes with tidal saltwater to create a rich and diverse aquatic ecosystem. This transitional environment supports a wide variety of fish, crustaceans, and mollusks, making it a productive destination for anglers targeting both brackish and coastal species. The river's estuary has faced environmental pressures including mangrove destruction, sedimentation, and urban effluent discharge, all of which have direct effects on aquatic fauna composition. Offshore, the river lends its name to the Japaratuba Canyon, a submarine canyon on the continental shelf of Sergipe that is associated with shrimp fishing using trawl nets, highlighting the broader marine productivity of this coastal system.