Start from Saint-Marcel metro station on line 5 (this is where Bourvil exits at the start of the film).
(S) Head along Boulevard de l’Hôpital towards Austerlitz. At number 40, turn left into Rue Poliveau (the scene with the pig at Jambier’s took place at number 13, even though Gabin mentions 45 Rue Poliveau in the film). Then take Rue Geoffroy Saint-Hilaire on the right. At No. 36, turn right into the Jardin des Plantes (in the film, Gabin and Bourvil walk along the edge of the garden). Join the main path and cross the entire garden to the exit at Place Valhubert.
(1) Cross the square and then the Pont d’Austerlitz. At the end of the bridge, turn right, then cross the Quai de la Rapée and turn left onto Boulevard Diderot. Just after No. 12 (Gare de Lyon on your right: the film’s final scene), turn left onto Rue de Bercy and follow it to the end. You’ll arrive at the corner of Boulevard de la Bastille (this is where the brasserie Chez Jacky used to be, the meeting place for Gabin and Bourvil, which no longer exists).
(2) Turn right onto the boulevard and, opposite No. 24, cross the Passerelle de Mornay. Continue straight ahead along Rue de Mornay, then, at the fork, turn right into Rue de Sully. At the end, turn left onto Boulevard Henri IV and cross the Pont de Sully.
(3) At the end of the bridge, turn right into Rue Saint-Louis-en-l’Île. At the end, keep slightly to the left to cross the Pont Saint-Louis. After the bridge, turn right onto Quai aux Fleurs. After No. 9, go down the steps on the left and follow Rue des Ursins. At the end of the street, turn left onto Rue de la Colombe, then left again onto Rue de la Chanoinesse. Take thefirst right, Rue Massillon, then right again to reach the forecourt of Notre-Dame.
(4) Cross the forecourt with your back to the cathedral and turn right onto Rue de la Cité.
(5) Cross the Pont Notre-Dame and continue straight on along Rue Saint-Martin. At the junction with Avenue Victoria, take the entrance to Square de la Tour Saint-Jacques on the left, walk past the tower and exit on the opposite side onto Rue de Rivoli, then follow it to the left.
(6) At No. 136, turn right onto Rue du Roule. Continue straight on towards the Church of Saint-Eustache, which is visible from a distance. Cross the Jardin des Halles, keeping in the same direction, and arrive in front of the church. Turn right, walking alongside the church, then, when you reach the junction, leave Rue Montmartre on your left.
(7) Take Rue Montorgueil immediately after on the left, opposite the grand steps of the Forum des Halles. After No. 71, turn left into Rue Leopold Bellan. At the end, turn right into Rue Montmartre. Opposite No. 160, turn left into Rue Saint-Marc, and at No. 10, turn right into the Passage couvert des Panoramas. On leaving the passage, cross Boulevard Montmartre and enter the Passage Jouffroy opposite. On leaving, cross Rue de la Grange Batelière and continue opposite into the Passage Verdeau. Exit onto Rue du Faubourg Montmartre.
(8) Turn left, cross Rue Richer and immediately afterwards take Rue Cadet, which further on becomes Rue Marguerite de Rochechouart. Just past No. 7, turn left into the small Passage de Briare. At the exit, head straight ahead into Rue Choron and follow it to the end. Turn right into Rue des Martyrs and follow it up to Boulevard de Clichy.
(9) Turn left onto the central walkway and follow it to Place Pigalle. On the square, take thesecond right onto Rue André Antoine, turn left at thefirst junction (still on Rue André Antoine) and walk up to the stairs. At the top, continue straight ahead into Passage des Abbesses. At the end of the passage, climb the stairs.
(10) At the top of the stairs, turn left into Rue des Trois Frères and, immediately, at a small square, turn right and climb the stairs leading to Rue Ravignan. Continue along this street and take thesecond left, Rue de la Mire. At the end of the street, climb the stairs. At the top, turn left into Rue Lepic. The route ends in front of the Moulin de la Galette, as the butcher’s shop on Rue Lepic featured in the film never existed outside the director’s imagination (E).
This route is excellent, and I carried on to St Vincent Cemetery, where Marcel Aymé is buried, and the Lamarck-Caulaincourt metro station.