The Canal Saint-Martin is the tenth arrondissement's open secret in plain sight: a working waterway with double locks, swing bridges and arched iron footbridges, threading north from the quais to the wide Bassin de la Villette. Plane trees lean over the water; the péniches (canal barges) still pass through the locks.
Three and a half kilometres, gently uphill in spirit if not in fact. Start at Jacques Bonsergent and drop to the Quai de Valmy — walk the bank, not the boulevard, for the independent shops. Past the Hôtel du Nord facade, where Arletty never actually filmed, then the Écluses des Récollets: wait for a barge if one's coming, because watching the gates work is the point of the canal.
The footbridges are the other point. Climb the Passerelle de la Grange-aux-Belles for the long view down the water. North of here the canal goes underground and surfaces again as the Bassin de la Villette, the widest water in the city — café terraces, a cinema, swimmers in summer.
End at the Rotonde de Ledoux, the 1788 customs pavilion, with Jaurès station at its foot.
