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
Source of the Amazon River distant source in the Rumi Cruz mountains with the coordinates of -10.732 Latitude and -76.648 Longitude at an elevation of . They also calculated the distance in river miles between the Apurimac River source (Mismi mountain) and the Mantaro River source to the junction of the two rivers. The Apurimac from source to mouth is long and the Mantaro is from source to mouth, thus making the total length of the Amazon longer than previously calculated. In their study of the Mantaro River, Contos and Trepcevich acknowledged that the flow of the river is interrupted several months a year by