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Coming from Fos-sur-Mer or Istres on the N569, head towards Saint-Blaise via the D51 or D52A.
Follow the D51 along the Citis lake and park in the first car park on the right (Saint Blaise archaeological site).
(S/E) Take the D51 towards Saint-Blaise and continue to the crossroads with a footpath.
(1) Turn right towards "Desté" and follow the road towards the Pourra lake, ignoring the paths on either side.
(2) Walk along the Pourra pond on your right. Take in the diverse flora and fauna. The path is narrow but passable. Walk around most of the pond, ignoring all the paths on your left, until you reach the crossroads of the Vaupianne valley.
(3) Take the path on the left to reach Vaupiane.
(4) Turn completely left, pick up a path coming from the right and join a crossroads at the corner of an open space. Leave the post office and turn left to find a wide track. Head left towards the equestrian centre near a car park, which is the starting point for various hikes. Enjoy a superb view of the Pourra pond.
(5) Continue straight ahead on the Chemin de Castillon, near a fountain, and turn slightly right onto a gently sloping path. Leave the Castillon forest house on your left.
(6) Begin the descent, turning right into an olive tree-lined lane. Join the road.
(7) Turn left and turn around, following the road, cross it and take the path on the right along a canal towards the Engrenier pond. Follow this pond. At the highest point, there is an interesting viewpoint.
Follow the Martigues canal on your right. Move slightly away from the pond on your right.
(8) Turn right onto the GRP® 2013 and head back to the Castillon car park.
(5) Continue on the GRP® 2013 in the opposite direction of the hike this time until you reach point (9).
(9) Turn left and continue on the GRP® 2013 trail northwards until you reach the car park of the archaeological site (S/E).
Visorando Member
Easy 
Tourist office
