Seine Seine The Seine ( , ) is a river and an important commercial waterway within the Paris Basin in the north of France. It rises at Source-Seine, northwest of Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English Channel at Le Havre (and Honfleur on the left bank). It is navigable by ocean-going vessels as far as Rouen, from the sea. Over 60 percent of its length, as far as Burgundy, is negotiable by commercial riverboats, and nearly its whole length is available for recreational boating; excursion boats offer sightseeing tours of the river
Almada River of Castelo Novo, Sambaituba and Aritaguá. From Aritaguá the river flows south parallel to the sea shore past Iguape, and empties into the Atlantic Ocean near the town of Ilhéus. The Almada River supplies water to the towns of Itajuípe and Coaraci. It supplies about 70% of the water used by residents of Itabuna. In the summer of 2015–16 water rationing was imposed due to low levels in the river, which had dried up in some sections. As of 2010 half the domestic sewage from Aritaguá was released directly into the river, while 25% went into pits in backyards, and