The Canal Saint-Martin is a 4.6 km long canal in Paris, connecting the Canal de l'Ourcq to the river Seine. Nearly half its length, between the Rue du Faubourg du Temple and the Place de la Bastille, was covered in the mid-19th century to create wide boulevards and public spaces on the surface. The canal is drained and cleaned every 10–15 years, and it is always a source of fascination for Parisians to discover curiosities and even some treasures among the hundreds of tons of discarded objects.

The Canal de l'Ourcq is a 108.1 km (67.2 mi) long canal in the Île-de-France region with 10 locks. It was built at a width of 3.20 m (10.5 ft) but was enlarged to 3.7 m (12 ft), which permitted use by more pleasure boats. The canal begins at Port-aux-Perches near the village of Troesnes, where it splits from the channeled river Ourcq, and flows to the Bassin de la Villette, where it joins the Canal Saint-Martin. Paris requires 380,000 cubic metres of water daily for cleaning the sewer system, gutters, and parks. The Canal de l'Ourcq provides about half of the requirement. Since 1983, the waterway has been designated for use by pleasure craft, and its water is designated for non-drinking uses.