La Mare Périlleuse
No doubt the writer Stéphane Mallarmé had already enjoyed this ride to the Mare Périlleuse, close to his domain... "Everything is pretty, a thousand greens and fragrant," he admired in the spring of 1896.Certified by FFRandonnée.
Avenue Fernand Dalaine
77850 Héricy
77850 Héricy
Route description :
1. With your back to the train station, go straight ahead, then turn right and left.
2. Follow the Seine on your left for about 3 km.
3. Turn left after the campsite, then left into Rue de l’Église (barn of Dîmes, church), and right, into Rue Grande. It crosses the railway line and leads to Rue de Montmélian. Turn right, then left, then take the path on the right between houses and gardens. Enter the woods towards the high-voltage line.
4. At its level, go left for 300 meters, turn right below it and climb the rock of Samoreau. Leave two forest tracks on the left, then on the right. The path runs along a wall for 250 meters, crosses a path in a thalweg, returns to follow the wall for 1 km and leads to a picnic area. Cross the RD39 (caution !), take the forest road, the path to the right then the left.
5. Ignore the street on the right, the path on the right, another on the left, then another on the right. Keep left at the junction. At the crossroads, take the second path on the left. Cross the RD210 and continue onto a path.
➢ Access to Mare Périlleuse, 250 meters on the left.
6. Bear right. Take the second path on the right for 1 km, then take the Graville à l’Épinard road on the left. It bends right, then left. Leave the woods towards the farm ahead, go straight on, then turn left, then right onto the small farm road and cross the RD227. At the water tower, follow the RD110 to the left and take the path on the right. It crosses a street, and a track. At the cemetery, turn left.
7. Follow the RD107, go down the path on the left then rejoin the RD107 on the left. It crosses two bridges.
8. Climb the path on the left (no waymarking).
9. At the crossroads, on the edge of the woods, go straight downhill. Take the street on the left, then the one on the right, and cross the street of la Fontaine-de-Sault. Go left towards the church then right towards the Seine. Follow the river on your left for 750 meters.
10. On the left, following the route used to get there, reach the train station.
Municipalities crossed : Champagne-sur-Seine, Féricy, Héricy and Samoreau
Distance : 20.9 km – Duration : 5h00 – Marked trail : Yellow - Difficulty : Hard
Access to the map : https://www.cirkwi.com/fr/circuit/282887-la-mare-perilleuse
1. With your back to the train station, go straight ahead, then turn right and left.
2. Follow the Seine on your left for about 3 km.
3. Turn left after the campsite, then left into Rue de l’Église (barn of Dîmes, church), and right, into Rue Grande. It crosses the railway line and leads to Rue de Montmélian. Turn right, then left, then take the path on the right between houses and gardens. Enter the woods towards the high-voltage line.
4. At its level, go left for 300 meters, turn right below it and climb the rock of Samoreau. Leave two forest tracks on the left, then on the right. The path runs along a wall for 250 meters, crosses a path in a thalweg, returns to follow the wall for 1 km and leads to a picnic area. Cross the RD39 (caution !), take the forest road, the path to the right then the left.
5. Ignore the street on the right, the path on the right, another on the left, then another on the right. Keep left at the junction. At the crossroads, take the second path on the left. Cross the RD210 and continue onto a path.
➢ Access to Mare Périlleuse, 250 meters on the left.
6. Bear right. Take the second path on the right for 1 km, then take the Graville à l’Épinard road on the left. It bends right, then left. Leave the woods towards the farm ahead, go straight on, then turn left, then right onto the small farm road and cross the RD227. At the water tower, follow the RD110 to the left and take the path on the right. It crosses a street, and a track. At the cemetery, turn left.
7. Follow the RD107, go down the path on the left then rejoin the RD107 on the left. It crosses two bridges.
8. Climb the path on the left (no waymarking).
9. At the crossroads, on the edge of the woods, go straight downhill. Take the street on the left, then the one on the right, and cross the street of la Fontaine-de-Sault. Go left towards the church then right towards the Seine. Follow the river on your left for 750 meters.
10. On the left, following the route used to get there, reach the train station.
Municipalities crossed : Champagne-sur-Seine, Féricy, Héricy and Samoreau
Distance : 20.9 km – Duration : 5h00 – Marked trail : Yellow - Difficulty : Hard
Access to the map : https://www.cirkwi.com/fr/circuit/282887-la-mare-perilleuse
Tarifs
Free access.
Prestations, conforts et services
- Level red – hard
Périodes d'ouverture
All year round daily.



