Start from Rue du 8 mai 1945, near the church in Leuville-sur-Orge.
(S/E) Go around the church of Leuville-sur-Orge on the left to take Ruelle de l'Église.
(1) Cross Rue Alphonse Réault and take the small path opposite for about 100 metres, then turn left and continue for 150 metres until you reach a left-hand bend. After about 30 metres, turn right onto Rue du Général Gallieni until you reach a crossroads.
(2) At the crossroads, take Chemin des Voiries (2nd on the right). Continue, taking the right-hand bend until you reach another crossroads. Turn left (Route de Brétigny) and continue for 100 metres.
(3) Turn left onto a small path that leads to the Petit Paris basin. Go around the basin on the right, keeping the Orge river on your right. At the end, cross the Salmouille and the Orge bridge and pass in front of a playground.
(4) Cross a second bridge and turn left. Walk along the Carouge basin on your right and go almost all the way around it until you reach a wooden arch.
(5) About ten metres before this arch, take a very small path on the left which leads a few metres further to a road (Chemin des Pâtures). Continue on the car park on the right and cross the road to walk alongside a group of houses on the right.
(6) At the next crossroads, go up opposite on a path through the fields (Chemin de la Marinière). Leave the Chemin des Renardes on your left (200 metres further on) and continue along this path, which leads to a road 1 km further on.
(7) Take this road straight ahead for 50 metres, then turn right to go down Rue de la Côte de Valorge. At the next crossroads, take Rue du Petit Paris straight ahead, cross over the Orge river and 60 metres further on, turn left onto the footpath and cycle path that runs alongside the Grande Boële.
(8) After a left-hand bend, cross a bridge and, 100 metres further on, turn right and continue along the Orge for about one kilometre.
(9) At the next intersection, take the path on the right and, 150 metres further on, cross a bridge. Continue straight ahead until you reach a road (Route du Moulin d'Aulnay) and follow it to the right, under the high-voltage power lines. At the next intersection, turn right and continue along the road for 600 metres until you reach a roundabout.
(10) Take a small path opposite (dead end) that climbs up to a rock. Continue to the next roundabout. Take the first left (Rue du Général de Gaulle). Pass two intersections on the right and take the third before the traffic lights (Sentier Jean Moulin – dead end). Continue along Rue Alphonse Réault.
(1) Turn left onto Ruelle de l'Église, which you took on the way there, follow it to the church and return to the starting point (S/E).