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The Seine is a 776 km long river and an important commercial waterway within the Paris Basin in the north of France. It rises at Source-Seine, 30 kilometers 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, 120 km (75 mi) from the sea. The Seine is dredged and oceangoing vessels can dock at Rouen, 120 km (75 mi) from the sea. Commercial riverboats can use the river from Bar-sur-Seine, 560 km (350 mi) to its mouth. At Paris, there are 37 bridges. The river is only 24 metres (80 ft) above sea level 446 km (277 mi) from its mouth, making it slow flowing and thus easily navigable.