Tour boats, commercial barges and pleasure boats enter the canal from the Seine 500 meters upstream (southeast) of Ile St. Louis, passing through a lock into Arsenal Marina.
At the northern end of the marina, the canal goes directly under Place de la Bastille as it begins a 2 kilometer-long tunnel section.
The tunnel opens into the first set of double locks surrounded by a small but very pleasant park, used by the neighborhood of the 10th arrondissement and tourists.
Several cast-iron or steel footbridges arch over the canal as it continues north; two swing-bridges for cross-street traffic open to allow the boats through.
For complete descriptions and many more photos see the e-book: