Access: Trappes station via the RER C or the Transilien N towards Rambouillet from Montparnasse station.
(S/E) With your back to Trappes station, turn left onto Rue Pierre Semard.
(1) Cross Rue Jean Jaurès and walk past the Omar Sy Cinema, then after the bend on the left, go up the stairs on the right onto the footbridge crossing the N10. Take Cour de la Corderie.
(2) At the junction, turn left onto Rue Magloire Aristide Barre.
(3) Then, at the bend, make a zigzag turn and enter a path (barely visible), then cross Rue Pierre Brossolette.
(4) Enter Parc des Bateleurs opposite, and head to the right.
(5) At the junction, turn left onto Rue de Montfort, passing in front of the Laurent Mourguet Nursery School and then the Parc du Cèdre.
(6) At the bend, take Allée de Montfort straight ahead, running alongside the Henri Matisse Vocational School.
(7) Opposite the Plaine du Moulin, turn right towards the Jean Guimier Sports Complex to reach Avenue Eugene Delacroix. Follow this avenue to the right towards the roundabout.
(8) Cross the Eric Tabarly roundabout and head straight on along Allée du Golf until you reach a junction. Continue straight on and follow the road until you see a barrier on the right at the start of a woodland area on a bend.
(9) Leave the road heading towards this barrier and take the path on the left, then cross the Rigole du Grand Lit. Take the road on the right and walk around the lake on the left-hand side.
(10) At the leisure island, turn right and walk past Les Remises, the sailing harbour and the beach.
(11) At the Velodrome at the end of the lake, turn right and walk along the lake, passing Les Quatre Pavés de Roy. Picnic tables are available. Continue along the lake until you reach a path on the right.
(12) Take this path through the forest and return to the edge of the lake.
(13) Turn left at the fork and head back to the car park, then turn right onto the Voie de l’Etang to complete the walk around the lake. When you reach the junction from the outward journey,turn left, cross the Eric Tabarly roundabout and continue straight ahead for about 100 metres. Turn right onto Allée de Maupassant, pass the George Sand Primary School, then take the second left, Allée des 2 Amis. Turn right onto Avenue Salvador Allende.
(14) After crossing the road, turn left onto Mail de l'Aqueduc, cross Rue Maurice Ravel and cross Place Naguib opposite. Turn left and take Rue Erik Satie on the right.
(15) Go round the roundabout on the left and join Rue Maryse Bastie, then take the second on the right and immediately turn left. This road bends to the right and, just after that, turn left onto a path leading to the Stade Yves Forges.
(16) Turn right and walk past the Maurice Thorez Nursery School, then follow Allée Claude Bernard to the left. Take a path opposite, slightly to the right, to reach Rue Paul Langevin. Turn left towards the Rond-point de l’Horloge.
(17) Turn right onto Rue Pont Marcel Cachin. Cross the bridge, cross the N10 and arrive at Trappes Town Hall and its junction.
(18) Follow Rue Jean Jaurès to the left, then Rue du Clos des Beauce to the right. Go round the left side of the Irene Joliot Curie Nursery School and arrive at Rue Irene Joliot Curie.
(19) Turn left onto this street and then right to return to Trappes station (S/E).