There are 37 bridges within Paris and dozens more spanning the river outside the city. Examples in Paris include the Pont Alexandre III and Pont Neuf, the latter of which dates back to 1607. Outside the city, examples include the Pont de Normandie, one of the longest cable-stayed bridges in the world, which links Le Havre to Honfleur.
The Seine rises in the commune of Source-Seine, about 30 kilometres (19 mi) northwest of Dijon. The source has been owned by the city of Paris since 1864. A number of closely associated small ditches or depressions provide the source waters, with an artificial grotto laid out to highlight and contain a deemed main source. The grotto includes a statue of a nymph, a dog, and a dragon. On the same site are the buried remains of a . Small statues of the dea Sequana "Seine goddess" and other ex voti found at the same place are now exhibited in the Dijon archaeological museum.
The Seine can artificially be divided into five parts:
The Seine is dredged and ocean-going vessels can dock at Rouen, 120 kilometres (75 mi) from the sea. Commercial craft (barges and push-tows) can use the river from Marcilly-sur-Seine, 516 kilometres (321 mi) to its mouth.
At Paris, there are 37 bridges. The river is only 24 metres (79 ft) above sea level 446 kilometres (277 mi) from its mouth, making it slow flowing and thus easily navigable.