The Canal de l'Ourcq is a 108-kilometre long and 3,7-metre wide canal which is part of the Paris Basin - the region of France constituting the lowland area around Paris. It begins at Port-aux-Perches (close to the town of Lizy) and flows to the Bassin de la Villette, where it joins the Canal Saint-Martin. The canal has 10 locks. The main function of the canal is to provide water for cleaning the sewer system, gutters, and the parks of Paris. The Canal de l'Ourcq provides approximately 190,000 cubic metres of water daily, which is about half of the total amount of non-drinkable water the city of Paris needs. The canal is also used by pleasure boats.