Rio Curu flows through the coastal zone of Ceará state in northeastern Brazil, draining into the Atlantic near the town of Paracuru (approximately 03°24'36" S, 39°01'50" W). The river is part of the Curu hydrographic basin, one of the smaller drainage systems along Ceará's coastline. Its lower reaches transition through estuarine and mangrove environments before meeting the sea, creating a diverse mix of freshwater, brackish, and coastal habitats that support a range of fish species. The basin as a whole supports 17 recorded freshwater fish species, making it one of the less species-rich basins in Ceará, though the estuarine and coastal zones add additional marine and euryhaline species to the angling mix.