The Mérantaise Valley

A short hike to discover the Mérantaise valley, the Croix du Bois, the Mérantais wash house, the village of Magny-les-Hameaux, the Maison des Bonheurs (family of 19th-century painters), the Domaine de Brouëssy, and the stele of Hélène Boucher (early 20th-century aviator).

Details

4304551
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 5.49 km
  • ◔
    Average duration: 1h 45 
  • ▲
    Difficulty: Easy

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 70 m
  • ↘
    Descent: - 74 m

  • ▲
    Highest point: 167 m
  • ▼
    Lowest point: 116 m

Photos

Description of the walk

Park in the car park of the "La Sente des Carrières" primary school in Voisins-le-Bretonneux.

(S/E) Take Rue de la Mérantaise for 100 metres, heading south and following the forest on your left. On your right is the Chamfleury residence, the first American-style residence, built by Kaufman & Broad in 1970.

Take the first path on the left, at the gate marking the entrance to the Port Royal National Forest, towards the Croix du Bois. Continue straight ahead for 600 metres until you reach the Parc de la Croix du Bois.

(1) Enter the park through the entrance gate. Cross the park and exit through the main entrance to the north-east, behind the rose garden. Then turn right into the forest and continue for 200 metres. When you reach a crossroads, turn right and follow the path for 200 metres until you reach another crossroads. Turn left and follow the path for 100 metres. On your right, you will see a clearing with a large white wooden cross at the end.

(2) From this viewpoint, you can see the village of Magny-les-Hameaux and its bell tower. Turn around and take the main path on the right. You will soon reach the old sandstone quarries on your left, which have been in operation since the 18th century. Once you have passed the sandstone quarry, continue straight ahead, taking the path along the cliff for 200 metres.

Then continue along the path, which now zigzags downhill. When you reach a T-junction, turn right and continue for 30 metres until you reach a sign. Turn left towards Châteaufort and follow the Mérantaise to the Mérantais wash house.

(3) Cross the bridge and continue straight ahead south on Chemin des Patisiaux, which climbs up to the village of Magny-les-Hameaux. Enter the village and, after 100 m, you will see the Maison des Bonheurs on your right. Continue straight ahead until you reach the church on your right.

(4) Continue and turn left onto Rue Ernest Chausson. At the crossroads, take Rue Eugène Carrière on the right. Leave the village by continuing straight ahead along Allée des Pommiers, which will take you to the Domaine de Brouëssy after 500 metres.

(5) Take Rue Paul et Jeanne Weiss on your right, which descends for 300 metres. At the crossroads, keep left and follow Route de la Butte aux Chênes. Pass La Mérantaise and continue uphill for 300 metres. Just before the last left-hand bend, turn right to enter the forest at the wooden barrier. Turn immediately left and climb the path for 50 metres. Once at the top, head left and you will find yourself near the Hélène Boucher memorial.

(6) Continue along the path for 100 m until you reach the trail you took at the start of the hike. Turn left, exit the forest and continue to the right until you reach the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 164 m - La Sente des Carrières Primary School
  2. 1 : km 0.83 - alt. 162 m - Parc de la Croix du Bois
  3. 2 : km 1.54 - alt. 157 m - Calvary of the Croix du Bois
  4. 3 : km 2.43 - alt. 116 m - Mérantais wash house. Bridge over the Mérantaise (stream) - Tributary of the Yvette - Mérantaise (ruissseau) - Affluent de l'Yvette
  5. 4 : km 3.26 - alt. 155 m - Saint-Germain Church in Paris (Magny-les-Hameaux) - Église Saint-Germain de Paris (Magny-les-Hameaux)
  6. 5 : km 4.3 - alt. 160 m - Domaine de Brouëssy
  7. 6 : km 5.12 - alt. 156 m - Stele of Hélène Boucher
  8. S/E : km 5.49 - alt. 164 m - La Sente des Carrières Primary School

Notes

There is a fountain next to the church in Magny-les-Hameaux.
There are several shelters available in the Parc de la Croix du Bois, at the wash house, in the village of Magny-les-Hameaux.

Worth a visit

(S/E) Résidence de Chamfleury, the first American-style residence built by Kaufman & Broad in 1970.

(1) Parc de la Croix du Bois. Built in 1906, this former hunting lodge was enlarged around 1914. Its Italian-inspired garden is considered remarkable, with numerous sculptures around the house and in the perspective to the bottom of the garden, where a stone kiosk stands.

(2) The Calvaire de la Croix du Bois is a large cross carved from a solid oak tree and nearly 4 metres high, on which Christ is crucified. It has existed since the end of the 18th century and gave its name to the park. From this vantage point, you can admire the village of Magny-les-Hameaux and its bell tower.

Between (2) and (3) The old sandstone quarries, which have been in operation since the 18th century. Every year, 40,000 sandstone paving stones were extracted and used to pave the Place d'Armes in Versailles. In 1836, there were 14 quarrymen in Voisins. The activity ceased in the early 1920s, although the Germans used it during the Second World War.

(3) Lavoir du Mérantais. Located on the banks of the Mérantaise, next to the ONF house, this is the main wash house in the commune. It has been maintained by the commune since 1908.

Shortly before (4) Maison des Bonheurs. The village of Magny-les-Hameaux was home to many artists, including the Bonheur family. Between 1860 and 1930, the Bonheurs settled here and turned this charming hamlet into one of the most fashionable artistic centres west of Paris. The former presbytery became a studio where the siblings Rosa, Auguste, Isidore and Juliette worked together.

(4) Saint-Germain Church in Paris (12th-17th century).

(5) Domaine de Brouëssy, consisting of a house and grounds built in the early 18th century by Pierre Cailleteau, known as "Lassurance", architect and controller of the King's Buildings. He bought the estate in 1711 and added land and farm buildings the following year. To build the family home, he bought materials from the ruins of Port-Royal Abbey.

(6) Stele of Hélène Boucher marked with a commemorative plaque. Hélène Boucher was a French aviator who broke numerous speed records. She was born on 23 May 1908 in Paris's 14th arrondissement and died on 30 November 1934 in Guyancourt. She became an aviator at the age of 21 and flew solo from Paris to Saigon in 1929. She broke the world altitude record in 1933 and several world speed records (444 km/h over 1,000 km in 1934). During a training flight, her plane caught the treetops and crashed there.

Reviews and comments

4.3 / 5
Based on 17 reviews

Reliability of the description
4.5 / 5
Ease of following the route
4.3 / 5
Route interest
4.2 / 5
Deran
Deran

Overall rating : 4 / 5

Date of your route : Apr 07, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

I start this route from the village of Villaroy, going around the golf course before entering the Mérantaise woods. It's a bit complicated at the moment with the tramway construction work and forestry work.
In front of the forest house, there are several alternatives: follow the path along the wash house, go up and turn left past the house, or go straight up and walk along the businesses once you reach the top.
I came out at the park and found Voisins via the path that passes near the Hélène Boucher memorial.
So I didn't take the route criticised by other hikers. I didn't go to Magny les hameaux.

Machine-translated

CHANTEUIL
CHANTEUIL

Overall rating : 4.7 / 5

Date of your route : Feb 28, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

PLEASE NOTE: Due to forestry work until July 2025, after the wooden cross, it is not possible to take the right-hand path leading to the old sandstone quarries. You will need to make a long detour to reach them and continue your hike. Chanteuil

Machine-translated

An-gie
An-gie

Overall rating : 4.7 / 5

Date of your route : Sep 09, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

A pleasant, easy-to-follow hike, but there is a particularly unpleasant section on the road in a bend.

Machine-translated

Noura
Noura

Overall rating : 3.7 / 5

Date of your route : Sep 01, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

Hello,

Stages 1 to 4 were pleasant, with beautiful scenery. Then there was the road and the very dangerous bend. We had to walk on the road with cars driving fast. I didn't feel safe. There are no other paths than the road. The only downside and negative point, but an important one. I won't do it again because of the road.

Machine-translated

Magicmb788
Magicmb788

Overall rating : 5 / 5

Date of your route : Aug 13, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely circular, pleasant and easy on varied terrain.
Just a short stretch on a small winding road for about 200 metres where you need to be careful.

Machine-translated

Schmilbilic
Schmilbilic

Overall rating : 4 / 5

Date of your route : Dec 27, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Thank you for this hike, which allowed me to discover the Mérantaise valley. A pleasant and varied route.

Machine-translated

Berzutti
Berzutti

Overall rating : 5 / 5

Date of your route : Aug 30, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant route, first through a rose garden, then into a wood, then along a stream. Finally, a pretty little village with Rosa Bonheur's house, and then back to the starting point.

Machine-translated

Tara Zanetti
Tara Zanetti
• Edited:

Overall rating : 3 / 5

Date of your route : Jul 09, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : No

Hike completed in 1 hour 19 minutes.
The first part is quite pleasant. Dogs are not allowed at the entrance to Croix du Bois Park, but you can take a detour to the right to reach the point (2).
However, the slope towards the point (2) is quite tricky and even dangerous, as the ground is quite slippery, so there is a risk of injury. It is best to have good walking sticks.
The most dangerous part is the road to the oak hill. You have to walk on the road, which is dangerous because of the bends and the fact that cars have very little visibility. So you need to be very careful.
This hike should be done in a group for safety reasons.

Machine-translated

Yann7991
Yann7991

Overall rating : 4.3 / 5

Date of your route : Jul 04, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

A route without much interest, you follow a path through fields and pass through a few villages. The second part, on the edge of the forest along the Merantaise, is nicer but nothing extraordinary to see

Machine-translated

daboloz
daboloz

Overall rating : 4.7 / 5

Date of your route : Jan 30, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A bit muddy at the end of January.
But a lovely little route, a change of scenery even though it's very close to the Paris metropolitan area.
Thanks to the author.

Machine-translated

Lucie3
Lucie3

Overall rating : 5 / 5

Date of your route : Oct 15, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant and interesting short hike. We walked around the park before starting.
The foliage of the trees did indeed hide the view of the village. We plan to do the walk again in winter to enjoy the view.
We really liked the wash house and the little bridge, and walking through the village with the Maison de Bonheurs.
Thank you for suggesting this hike to us.

Machine-translated

virgie1812doma
virgie1812doma

Overall rating : 4 / 5

Date of your route : Jul 01, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

The first part of the route is pleasant. Unfortunately, we were unlucky: the Parc de la Croix du Bois was closed for three days, which meant we had a bit of trouble finding our way... There's a viewpoint over the village (too many leaves), but you can see the bell tower clearly! The wash house area is really beautiful and Magny le Village is very cute. We were very disappointed when we left Brouessy, as the lowest point of the route was almost "on" the road, as the verges were so overgrown with weeds. And at the time we passed through, the traffic was really heavy, making this section very dangerous. The climb back up to the forest path was not very pleasant, again because of the cars. Perhaps try it at another time... This hike does, however, reveal many other paths to explore!

Machine-translated

fredo123
fredo123

Overall rating : 4.7 / 5

Date of your route : Apr 18, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful hike that quickly transports you to another world. A lovely immersion in the woods, beautiful views of the valley... a short stretch of road at the end.

Machine-translated

Didiovisorando
Didiovisorando

Overall rating : 3 / 5

Date of your route : Feb 28, 2021
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

There are virtually no signs on the ground, so the route marked on the map is insufficient

Machine-translated

Rose-Marie F.
Rose-Marie F.

Overall rating : 5 / 5

Date of your route : Feb 19, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

An interesting, very pleasant and varied route. I did it on my own and it was a great change of scenery from my usual walks in the forest around Versailles-Viroflay during the health crisis.

Machine-translated

Other walks in the area

For more walks, use our search engine .

The GPS track and description are the property of this route's author. Please do not copy them without permission.