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Start: Rue de Gournay, opposite no. 29, the former address of the town hall of Oinville-sur-Montcient. Parking along Rue de Gournay or in the courtyard behind the former town hall (if still accessible).
Access: Oinville is located north of the Seine, on the D913 road between Meulan-en-Yvelines and Vétheuil.
Red and white signposts
(S/E) With your back to the building, turn left onto Rue de Gournay, towards the D913. At the roundabout, turn left to cross the Montcient river. Cross the D913 road and follow theGR®2opposite, Rue de la Nourrée (ignore the yellow arrow pointing to the right). Go up into a residential area, ignore a lane on the left and then another on the right.
At a fork, turn left. Quickly leave the Sente des Perdreaux turn left and continue straight ahead on a path starting behind a forest barrier. Go over another forest barrier further up, cross a road and continue straight ahead, leaving house no. 26 on your left. Go up between two hedges, come out into open fields and arrive at a T-junction (with a fenced meadow opposite).
Yellow signposting
(1) Leave theGR®2trail on your right and turn left onto a good path.
For about 3.5km, until the point (3), the route will keep heading west then north-west and remain on a slight incline along the "ridge" (a fairly rounded ridge nonetheless) with a clear view on both sides.
Follow a hedge on your left, then walk between the fields. Pass a tin hut on your right and, at the next crossroads, continue straight ahead on a wide gravel track (be careful, twoPR® trails cross here; ignore the signpost on the path on the right that goes downhill). Walk through the fields, with a hedge on your left at times. Ignore a path on the left and, at a fork, turn left to walk alongside a football pitch on your right.
(2) Cross a small road (sign for Oinville) and continue straight ahead with a hedge on your left, then between the fields. Walk alongside a second football pitch, this one on your left. Then cross a small road and continue straight ahead towards two copses visible in the distance.
After a hedge on your right, you will come to a crossroads at the corner of a wood (elevation 127). Continue straight ahead and follow the wood on your left, then a hedge on your right. Just after a stone on the right-hand side of the path with a faded yellow arrow, you will come to a crossroads in the middle of fields (houses and meadows in the distance on the right).
(3) Turn left at a right angle onto a path that turns left (south-east) less than a hundred metres further on. Descend gently, following a small wooded plot on your left. Just after this, behind half a dozen trees taller than the others, you will find the covered lane known as Cave aux Fées on the right of the path (information sign).
(4) Continue down the path, heading south-east then south. When a path comes from the left, turn right and follow the fence of a house on your right. At the T-junction, follow the D913 road to the left. At the next junction (no. 54), turn right towards the Saint-Denis church (sign) and follow Rue du Pont Madame. Follow the wall of an old castle on your right (square dovecote), cross the Montcient (wash house on the left). At a fork, take the Rue de l'église on the left and continue until you reach the church (the purple line on the IGN map is inaccurate here).
(5) Turn right onto Rue Thomas, leave the church on your left, and go up the hill, veering to the right. At the end of the street, rejoin Rue du Pont Madame and turn left twice to follow Rue de la Carrière (dead end). At the crossroads at the top of a hill (no. 15 on the street), ignore the path that branches off to the right and continue, veering slightly to the left.
Go down a path with a wall on your left, pass a block of stone across the path and you will come to a paved alleyway. Turn left at an acute angle and go downhill again. At the junction at the bottom of the hill, turn right towards the "fin de zone 30" sign. Keep to the right-hand side of the road, where there is a pavement, which is narrow but slightly raised above the road.
(6) At the junction before the sign for the exit from Brueil-en-Vexin, leave the road on the left (take care when crossing) and take a path that starts to the right of a wall and to the left of an old stele (information sign). At the first fork, ignore the left-hand lane which leads into a field. Go up with a meadow on your right, then along the edge of the woods on your left and finally between the fields.
At a T-junction (with wasteland opposite), turn right, cross a small wood and then turn left and stay on the edge of the wood. At the corner of the wood, turn left and continue along the edge or in the wood near its edge, slightly downhill.
(7) At the bottom of the descent (red pole indicating an underground oil pipeline), turn left, following a meadow on your left and continuing slightly downhill (be careful, there are twoPR® trails at this point; do not follow the one that goes up opposite). Turn right, enter a wood and follow a pleasant, shaded path.
At the edge of the woods, stay on the edge with a meadow on your left. Note a post on the right side of the path but ignore two similar posts further down on the left. Make a quick left-right turn to cross the meadow and descend again into the woods.
(8) At the junction with a path on the right coming down from a wood, turn left at a right angle and descend. Turn right and leave the old Moulin Brulé on your left. At the corner, turn left to cross a branch of the Montcient and continue along a wide path between two property fences.
Cross the second branch of the Montcient and, immediately after, follow the D913 road to the right. Continue along this road for about 300 m, then turn right into Rue de Bachambre towards the schools (sign). Cross another branch of the Montcient (wash house on the right).
(9) At No. 35, do not cross the other arm of the Montcient but leave the street and turn left onto Rue de la Monticent, which is a paved path that becomes grassy further on. Stay on the path closest to the river (on your right). Ignore a metal footbridge on the right and continue along the river until you reach a wash house. Pass under the roof of the wash house and, a few metres further on, you will come out onto Rue de Gournay. Follow the street to the left downhill to return to the starting point (S/E).
Visorando member
Association / Club / Walk leader
Easy 
