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Departure from the Château de Chalo-Saint-Mars car park.
(S/E) Walk down Rue Doc Solon for 150 metres and take the first street on the right towards Les Sablons. Continue for 150 metres until you reach the signpost for the routes of the Louette and Chalouette.
(1) Turn sharply left onto Rue de la Picharderie. Walk 250 metres uphill to a bend in the road leading to the hamlet of Les Sablons. Follow this road to the right for 700 metres.
(2) At elevation 122, turn left onto the path at the edge of the woods, formerly known as the Route par le Haut (Louette and Chalouette route marker). Cross the Bois des Bouleaux and continue along the edge of the woods until you reach the high-voltage power line.
(3) About 200 metres after the high-voltage power line, take the path on the left that leads to the D21 road (pass under the high-voltage power line again). Follow the D21 to the right for 50 metres.
(4) Leave the road and follow the Sente de Longuetoise on the left, just before the power line, keeping the road on your left. Turn right and continue along this path to cross La Chalouette. After about 100 metres, turn left and follow the Louette (path not shown on the IGN map). Cross the river at the first bridge and continue for 50 metres to the cycle path. Turn left onto the road overlooking the Moulin Vaux watercress beds and continue for 750 metres until you reach the power lines.
(5) About 20 metres after the last house on the right, take the path on the right which leads via a staircase to the Route de la Pierre Levée, which connects Saint-Hilaire to Pierrefitte. Follow it to the right for 100 metres and at the hamlet of Les Cours and the first house on the left, turn left onto the path (yellow markings) that climbs up to the northern plateau. At a fork (at contour line 125), take the path on the right.
(6) At the T-junction, turn left and follow theGR®111B(red and white markings) westwards.
(7) At the crossroads, turn left into Allée des Cèdres (giant sequoia). At a fork, follow the path on the right towards Saint-Hilaire. Continue straight on Voie Montoire de la Croix. When you reach Route de la Pierre Levée, continue straight on Rue Louis Chenu, then turn left onto Rue de la Louette. After 200 metres, you will reach the cycle path.
(8) Turn right (north-west) onto the path that runs alongside the Louette. Pass close to the hamlet of Les Boutards and, 200 metres further on, cross the D82 road. Continue straight ahead on the old railway line path that runs alongside this road for 1.5 kilometres.
(9) Find theGR® markings (red and white) and continue west on the old railway line. Cross the Bois des Granges forest until you reach the high-voltage power line.
(10) Just after the high-voltage power line, leave theGR®111Band take the path that climbs to the left into the Côte à Cochon. At the T-junction (elevation 143), turn right onto Chemin de la Malpauderie.
(11) At the next junction, turn left (south) onto theGRP® du Hurepoix (red and yellow markings). At the next fork (elevation 137), follow the path on the left to the high-voltage power line. Still on theGRP®, turn right under the power lines and reach the D21 road. Follow it to the right for 500m, at the Croix de Saint André, leave the D21 and follow theGRP® to the left for 300m.
(12) When you reach the V-shaped intersection, leave theGRP® trail on your right and continue straight ahead. You will rejoin theGRP® trail 300 metres further on and follow it again, turning left. Pass in front of the lagooning basin and then under the high-voltage power lines.
(13) At the fork, leave theGRP® again and take the path on the right along the edge of the fields. Further on, rejoin theGRP® (Montoir des Roches) and follow it to Guerville.
(14) Leave theGRP® trail on your right and follow the D160 road on your left to Beaumont.
(15) At the bus stop, turn right onto the path that leads to La Louette. Turn left and follow the river, crossing it at the second bridge.
(16) At the hamlet of Boinville, 150 metres after the bridge, rejoin theGR®111and continue straight ahead for about 100 metres. Turn left onto theGR® heading east and follow it through the Vallée Vigneron to Bois Amande.
(17) Turn left and continue on theGR®111north for 600 metres. Then take the path on the left that descends along a small road. When you reach another road, follow it to the left for 20 metres.
(18) Turn right, cross the road and follow the Sente du Vau path which crosses La Chalouette. You will arrive at the D160 road in the hamlet of La Voie Neuve.
(19) Follow the road to the right for 50 metres. Continue on theGR®111with the path that climbs to the left. When you reach the edge of the northern plateau, make a hairpin turn to the right and head north-east.
(20) At the next crossroads, turn sharply right, still on theGR®111, and descend towards the valley.
(21) At this junction, leave theGR® and turn right onto the Côte de Chantepie. After 200m, turn sharply left onto the D160 road.
(22) Turn right, cross the Louette and follow the Chemin de la Fosse au Mal Sanson. Cross the Marette river and pass close to a riding school. When you reach Route au Gué de La Fosse, cross it and take the path opposite, which climbs left towards Montoir de la Gitonnière until you reach a barrier (marker with yellow markings; this path is not shown on IGN maps).
(23) Turn left onto a farm track and follow it for about 1 km.
(24) At the crossroads, turn left (north, yellow marker) onto a path that descends into the undergrowth. When you reach Les Sablons, turn right onto the street.
(1) At the next fork, take the street on the left. At the next crossroads, turn left to return to the starting point.
Visorando member
Moderate 
Easy 
