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Parking is available in the public car park at 30 Chemin de la Corne de Cerf, signposted with a "P" sign at the entrance to the village of Saint-Martin-la-Garenne on the D147 when coming from Limay/Mantes-la-Jolie.
Yellow signposting
(S/E) On leaving the car park, turn left onto Chemin de la Corne de Cerf. At the next crossroads (note the restored old buildings on your right), continue straight ahead onto Rue du Vieux Puits. This will take you to the church square (you can walk back to the other side to see the old priory and a wash house). Then follow the D147 to the left towards Vétheuil. Before a right-hand bend, turn left onto Rue Raoul Lescène towards Sandrancourt. Cross one street on the right, then one on the left, and continue straight ahead.
(1) Before No. 141 on the left, turn right onto a path that descends between two fences. After about 50 metres, ignore the turn-off on the right and continue straight ahead. At the next crossroads (elevation 37), make a right-left zigzag and continue in the same direction (north-west) through bushy vegetation and shrubs. After a grove of conifers, ignore a turn-off on the left and continue straight ahead.
(2) At the T-junction, turn left (information sign about the Seine hills on the left). Keep west-southwest on a wide, good path along the edge of vast fields on the right and the edge of a wood on the left, ignoring all turnings on either side. After crossing a strip of woodland, pass a water treatment plant on your left (not shown on the IGN map). Continue along the wide road until you reach the road linking Saint-Martin and Sandrancourt.
(3) Follow the road to the right. At the next crossroads, continue straight ahead (the purple line on the IGN map is inaccurate here) and follow an old quarry on your left. When the road begins to bend sharply to the right, continue straight ahead on a path lined with a hedge on the left. Note the Chapelle Sainte-Anne on your right, seen from behind (the path is called Chemin de Derrière la Chapelle). At the junction with a street, take the Chemin des Gloriettes opposite, slightly to the left. At the end, go through a forest gate and you will come to the bank of the Bassin de l'Îlon.
(4) Then turn slightly to the right and follow the basin on your left. After two right-hand bends, at an information sign, take the stabilised path for pedestrians and cyclists on the left (not shown on the map at this exact location). Turn left onto the stabilised path and follow the entire north bank, with the basin at varying distances. On the right is a dense copse making the right bank of the Seine inaccessible, followed by a meadow.
(5) At the end of the paved path (forest barrier), turn left onto a paved road and take a footbridge (view on the left of the Port de l'Îlon). At the south-western tip of the basin, continue straight ahead on a small road (ignore the yellow arrow indicating to turn right; twoPR® trails intersect here).
(6) After a green gate on the right, climb the embankment on the right and head for a bird observatory (nature reserve). Continue along the path on the embankment parallel to the road. At the end (another observatory, information boards), return to the edge of the road and continue to the next junction.
(7) Cross the road and follow it to the left. Just after the bus stop, turn right onto a path in the undergrowth (there is a stone across the path at the start). Keep a short distance away from a field on your right and, at the corner of the field, turn right. Continue through the undergrowth and then along the edge of the woods on your left. At the crossroads about 50 metres after the end of the woods, turn left (east) onto a farm track (no signpost here). Walk alongside young trees on your left and continue between the fields. The track turns left and then right and is bordered on the left by a hedge and bushes. Pass a pumping station on your right and continue to a crossroads (electric pole opposite).
(8) Then follow the road to the right and another farm track. Ignore a grassy path coming from the right and, at the next crossroads, continue straight ahead, passing a model aircraft club. At the next crossroads, at the entrance to the club, turn left onto the grassy path that climbs towards a wood (no signpost here).
(9) Enter the Bois de la Garenne and follow the signs. Walk north-east, cross a road and continue opposite through the undergrowth (the "Entrée interdite" sign only applies to the interior of the woods, not the path). Stay on the main path to the northeast and ignore all side paths (in particular thePR® path on the right, level with a tree marked with the number 9).
(10) At the fork shortly after a tree bearing the number 12, take the path on the right (the one on the left is less clear and less inviting). Leave the woods and walk along a field on your right. Keep heading north-east, alternating between the undergrowth and the edge of the woods on your left, keeping the bell tower of Saint-Martin church in sight. Walk along a small vineyard on your right (information sign). At the first houses, the path gives way to a tarmac lane. You will soon come to the car park on your left (S/E).
Visorando member
Easy 
