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–Oise–Marne culture Seine–Oise–Marne culture The Seine–Oise–Marne or SOM culture is the name given by archaeologists to the final culture of the Neolithic and first culture of the Chalcolithic in northern France and southern Belgium. It lasted from around 3100 to 2000 BCE and is most famous for its gallery grave megalithic tombs which incorporate a port-hole slab separating the entrance from the main burial chamber. In the chalk valley of the River Marne rock-cut tombs were dug to a similar design. Some have examples of megalithic art with images of axes, breasts and necklaces carved on their walls. Diagnostic artefacts include transverse