Rio Sergipe is a significant river system flowing through the state of Sergipe in northeastern Brazil, stretching approximately 133 miles before emptying into the Atlantic Ocean near the city of Aracaju. The river's lower reaches and estuary zone are particularly productive for fishing, where freshwater mixes with tidal saltwater to create a rich, diverse ecosystem that supports a wide variety of fish species. The mouth of the river — known as Barra do Rio Sergipe — is a well-documented nautical area and serves as a focal point for both recreational and artisanal fishing activity. The estuarine and coastal character of the lower river makes it a dynamic fishery where anglers can encounter both inshore saltwater species and freshwater residents depending on where they fish along the system.