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Parking available on Allée des Pins.
(S/E) From Allée des Pins, head to Place du Château in the heart of the old town of Fos, on the left when arriving from the north.
Go up a small street on the left that leads to the foot of the bell tower. Reach the walls of the old fortified castle by going around it on the right. Follow the rampart walk, then walk along the cemetery to reach the church.
Then walk down alongside a car park to find an opening in the ramparts where a wooden staircase leads down to a beautiful viewpoint over the Étang de l'Estomac lake.
(1) Go down these steps (don't miss the door marking a passage under the cliff supporting the church) and join the street below. Take this street on the right to cross the entire town centre and then a residential area until you reach a canal. Cross the canal via a small bridge and go up a path on the left. You will reach a barrier marking the entrance to the restricted area of the Étang de l'Estomac and the salt marshes, where dogs must be kept on a leash.
(2) Follow the path straight ahead along the canal. After a few dozen metres, turn right to go to an observatory on the edge of the pond where you can enjoy watching the birds.
(3) Retrace your steps and continue along the canal on the right until you reach the sports fields.
(4) Turn right and follow the path that runs alongside the pond. You will soon reach a dyke that divides the pond into two parts.
(5) Cross the pond by taking the path along this dyke.
(6) Before reaching the end of the dyke, turn right immediately and follow a canal. Follow this path around the pond until you reach the high-voltage power lines.
(7) Turn right again onto the track that runs alongside the lake under the high-voltage power lines. On the left, behind the canal, are the old Fos salt marshes, now almost completely dry. At the end of the track, you will reach the barrier to the restricted area.
(2) Turn left and follow the path that runs alongside the canal to the arena car park. Cross the canal, then Avenue Jean Moulin and Avenue Jean-Jaurès at the roundabout and follow Route des Plages for a few dozen metres.
Then turn right onto a small street, Chemin de la Chapelle, which takes you past the Notre-Dame-de-la-Mer Chapel. Then join Avenue Jean-Jaurès a little further on and continue on the left to find Allée des Pins in the extension (S/E).
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