The Canal Saint-Martin is a 4.6 km long canal in Paris, connecting the Canal de l'Ourcq to the river Seine. Over nearly half its length, between the Rue du Faubourg du Temple and the Place de la Bastille, it 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.