The Seine flowing under Pont Royal in central Paris.
|Origin||Source-Seine, Côte-d'Or, Burgundy|
|Mouth||The English Channel
(Bay of the Seine at Le Havre)
|Basin countries||France, Belgium|
|Length||776 km (482 mi)|
|Source elevation||471 m (1,545 ft)|
|Avg. discharge||500 m3/s (18,000 cu ft/s)|
|Basin area||78,650 km2 (30,370 sq mi)|
The Seine is a river in France. It verses into the English Channel between Le Havre and Honfleur. With 777 km length it is the second-longest river in France. Other important cities along its course are Paris, Troyes and Rouen. Its drainage basin has a surface of 78,650 kilometres (48,870.84 mi). About 30% of the French polulation live there. It rises in Source-Seine, in Côte-d'Or, Burgundy, at an height of 444m.
Between Rouen and the sea, the Seine is navigable by ocean-going vessels, of up to 280m in length, and 150.000 tons in weight. This section of the river has a length of about 120 kilometres (75 mi). Ships of a draft of up to 10 metres (33 ft) can circulate. Draft is a word describe the height of the part of a ship that is below the water line. There are three bridges in this section. They can be raised. The maximum air draft (or height above the water line) of a ship is 50 metres (160 ft). Because there are few briges, the river can be crossed by ferry, at different locations. The port of Rouen is an important maritime port in France; it is the most important port in Europe for cereals, and the most important port in France for flour and fertilizers. Even if the port of Le Havre is more important for petroleum, that of Rouen is still important. About 25 million tons of produce is handled by the port of Rouen each year.
The course of the river was corrected between Rouen and Paris in the 19th century. There are seven locks. Barges with merchanise, of a capacity of up to 350 t can circulate. The dimension of the lock determines the maximum dimension of the ship. When most canals were built in France, the mister for public works, Charles de Freycinet determined the maximum length of the locks. As a result, the maximum dimension of the ship are 38.5 metres (126 ft) by 5.05 metres (16.6 ft), with a draft of 2.5 metres (8 ft 2 in). In the case of the French canals, the maximum draft is 1.8 metres (5 ft 11 in). The load of a peniche is about that of ten lorries or eight rail waggons. Other ship types that can circulate have a capacity of 800 tonnes (790 LT; 880 ST) to 1,350 tonnes (1,330 LT; 1,490 ST). Convois of barges with a length length between 40 metres (130 ft) to 70 metres (230 ft) and can transport betweeen 3,000 tonnes (3,000 LT; 3,300 ST) and 10,000 tonnes (9,800 LT; 11,000 ST) of freight. Other ships include river-vessels that can transport up to 4,000 tonnes (3,900 LT; 4,400 ST) of freight.
The port of Paris is the most important fluvial port in France. About 20.2 million tons of merchanise is handfled by the port each year. 20 miilon tons of this comes from fluvial transport. There is a project called Seine–Nord Europe Canal, to build a high-capacity canal to connect the Paris region to the Ports of Antwerp, Dunkerque and Rotterdam, for large ships of a with of 11.5 metres (38 ft) width and 185 metres (607 ft) length.