Seine Commercial craft (barges and push-tows) can use the river from Marcilly-sur-Seine, to its mouth. At Paris, there are 37 bridges. The river is only above sea level from its mouth, making it slow flowing and thus easily navigable. The Seine Maritime, from the English Channel at Le Havre to Rouen, is the only portion of the Seine used by ocean-going craft. The tidal section of the Seine Maritime is followed by a canalized section ("Basse Seine") with four large multiple locks until the mouth of the Oise at Conflans-Sainte-Honorine (170 km). Smaller locks at Bougival and at Suresnes lift the
Seine-et-Oise Seine-et-Oise Seine-et-Oise was a "département" of France encompassing the western, northern, and southern parts of the metropolitan area of Paris. Its "préfecture" (capital) was Versailles and its official number was 78. Seine-et-Oise was abolished in 1968 as part of the reorganization of the départements of the Paris metropolitan area. Seine-et-Oise was created on 4 March 1790. Its name comes from the two main rivers (Seine River and Oise River) flowing through it. At its dissolution in 1968, Seine-et-Oise consisted of 688 suburban and rural communes completely surrounding the Seine "département" although it was at its narrowest just east of Seine