Rio da Madre flows through the coastal lowlands of Santa Catarina, Brazil, draining into the Atlantic coastal zone in a region characterized by a mix of freshwater and brackish environments. The river winds through a landscape typical of southern Brazil's coastal plain, where freshwater currents meet tidal influences near the coast, creating a dynamic estuarine zone that supports a diverse and productive fishery. This blend of environments makes the Rio da Madre an appealing destination for anglers targeting both freshwater and coastal species throughout the year.