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Starting point and access: Presles-Courcelles station.
- Transilien - Line H, on the section between Paris-Nord and Persan-Beaumont via Monsoult-Maffliers.
Go to the end of the platform and take the side exit, at the rear of the train when arriving on track 1 (towards Paris and Montsoult-Maffliers to Persan-Beaumont), at the front of the train when arriving on track 2 (in the opposite direction).
Yellow signage
(S/E) At the end of the platform, go through a small gate and turn left into the street (cross the tracks at the level crossing if you arrived on track 1). Cross Rue Daniele Casanova and follow Rue Alexandre Prachay opposite. Take thefirst left, Rue des Cocagnes.
No markings
At the stop sign, continue straight ahead and go uphill (ignore the yellow markings on the right). Ignore thefirst right, Sente des Daubes, and turn right at the next intersection, still on Rue des Cocagnes.
(1) At the fork, turn right and leave the forest house on your left. Continue uphill and cross a small lane on the right-hand side. When the street turns right and becomes Allée de la Sablonnière, continue straight ahead on a path that starts with a fence on the left-hand side. First under a tunnel of vegetation, the path continues in a more open area. Ignore a path coming from the left. At the next crossroads, continue straight ahead (east-north-east) on a wider path (post of an old forest barrier on the left-hand side).
(2) At the next crossroads (two-trunk beech tree on the left), take thesecond path on the right (east-southeast; pink arrow on a tree trunk). At a fork (plot no. 57), turn left (ignore the pink arrow pointing to the right) and follow the slight uphill path. Cross a bridle path and continue straight ahead.
Yellow markings
You will come out onto a wide path; follow it to the right for about 150 metres.
(3) At the crossroads, take the4th path on the left (east). Walk between a thick forest on your left and a thinned forest on your right. At a crossroads, go straight ahead, veering slightly to the left, and pass by a pond on the left-hand side. At the end of the path, follow a small tarmac road to the right and, immediately afterwards, take a path on the left that enters the forest. You will arrive at the southern tip of Lac Bleu.
Yellow + red and white markings
(4) Then take thefirst path on the right and follow theGR®1. Go through a forest gate and cross a car park. At the signpost, follow the Route de la Touffe straight ahead and go through another forest gate. Walk south on a slight downhill slope. At a crossroads, go straight ahead and descend more steeply. When you reach the bottom of the valley, climb back up.
Red and white markings
(5) At the crossroads, turn right and descend again (but do not go too far to the right in the valley). At the next crossroads, continue straight ahead, climbing gently.
Yellow + red and white markings
You will come to a small tarmac road. Follow it to the right downhill. Just after a metal barrier (car park), leave the road and turn left into the undergrowth. Pass a picnic table and you will reach the covered walkway of the Pierre Turquoise.
(6) With your back to the entrance to the covered walkway, go opposite and find a discreet path (follow the markings carefully). Cross the road and continue opposite downhill (beautiful beech trees).
Yellow markings
(7) At the crossroads below, turn left and stay in the valley. The path soon gives way to a winding trail. At the road, turn right and, at the fork immediately ahead, turn left. Walk along a fenced pond on your left and stay in the forest. At the first houses, the path gives way to a narrow street. Come out onto a street, follow it to the right for about 20 metres, then turn left onto Rue Alexandre Prachat.
Yellow + red and white markings
(8) At the stop sign, turn left onto Rue du Bois Belle Fille. Cross a stream, turn right onto Chemin des Bourbiers and walk along the wall of Parc de Courcelles on your right. At the stop sign, turn right and stay on the right-hand side of the road, behind the safety barrier.
Yellow markings
At the next intersection, cross the D78 (caution, busy road) and follow the D64E to the left towards L'Isle-Adam (let theGR® continue straight ahead). Pass under the railway bridge (caution, narrow shoulders).
(9) Pass the large old buildings of an equestrian centre at a place called La Cave and follow the tree-lined road uphill, preferably on the right-hand side (which is wider). Shortly before the top of the hill, just after a tree with an arrow on it, leave the road and take a path that branches off to the right at an acute angle. You will soon come to the covered walkway of Blanc Val at the edge of the path. Continue to a crossroads (on the right, there is a "Slow down" sign that seems to be aimed at cyclists rather than pedestrians).
Red and white markings
(10) Find theGR®1and follow it to the left (south-west) along a grassy path between the fields.
Yellow markings
At the end, before the stop sign, turn sharply right onto a small road. At the foot of a "No Entry" sign, take a farm track on the left. After about 500m, you will reach a T-junction (the path that leads opposite on the map no longer exists, it has been ploughed...).
(11) Then follow a small tarmac road to the left (ignore the yellow cross marking the oldPR® route). At the next junction, turn right towards Beauvais (cycle sign) and take a gravel track. At a three-way junction (elevation 88), turn right. Stay on the edge of the woods and ignore a path on the left.
(12) At the intersection at the corner of a fence (marker post), follow the arrow on the left pointing towards Pierre Plate. At the next corner of the fence, continue straight ahead. Climb the embankment of the path when it turns left and go straight ahead towards the covered walkway of Pierre Plate. The monument is fenced off, but there is an official opening that allows you to see it up close.
(13) Retrace your steps.
(12) Once back at the edge of the woods, turn left and walk along the fence of a golf course. At the next intersection (elevation 83), continue straight ahead, still along the edge of the golf course. At the fork, two PR® trails separate: take the one on the right. Very quickly, the path turns into tarmac. At the next crossroads, turn left onto Chemin des Mauvais Payeurs between allotments on the left and the cemetery on the right (note the monumental chapels). At the foot of the water tower, turn sharply right and follow a small road, preferably on the left-hand pavement (which is wider).
(14) At the crossroads (statue of the Virgin Mary), turn left and go down the street in the wrong direction, first on the pavement on the left and then, after the pedestrian crossing, on the pavement on the right. Before a bend, turn into a cobbled alley on the right and go down a flight of steps. Cross a street and then the paved square between the church on the left and the war memorial on the right. Go down another staircase and turn left into the street at the end of the church. At the crossroads, turn right and go slightly downhill. Pass in front of the Sports and Leisure Centre and, at the stop sign, continue straight ahead uphill. This will take you to Presles-Courcelles station (S/E).
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Visorando member
Difficult 
Easy 
