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
Abbey of Saint-Seine Sainte-Marie de Cestres, or Cestres Abbey. In time, the town of Saint-Seine(-l'Abbaye) grew up round the monastery. After Sigo's death in 581, his name gradually changed to "Soigne", then "Seigne", and finally "Saint Seine", apparently under the influence of the nearby sources of the River Seine. In the 8th century the great reformer Saint Benedict of Aniane made his profession and became a monk at Saint-Seine. He practised a rigorous asceticism and studied the various monastic rules then in use, including the Rules of Saint Pachomius, Saint Basil the Great and Saint Columbanus. He became the abbey's cellarer. In about