Sandstone quarries, Moulin d'Ors, Pont du Gar, Moulin des Vassaux, GorgesCur

In addition to introducing you to the Domaines d'Ors nature reserve, this route is of interest because it allows you to discover the old sandstone quarries at the start of the route, which are ideal for fun activities, and the Ruisseau du Fond de la Cure at the end of the route, whose steep gradient and the sound of the torrent give the impression of a mountain trail.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 7.18 km
  • ◔
    Average duration: 2h 15 
  • ▲
    Difficulty: Easy

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 81 m
  • ↘
    Descent: - 82 m

  • ▲
    Highest point: 155 m
  • ▼
    Lowest point: 82 m

Photos

Description of the walk

Park in the Bassin de Buisson car park.

(S/E) On the left side of the Cure, there is a green metal forest barrier. Take the path that leads into the forest and ignore the paths on the left.

(1) Your path will cross a sunken lane. If you want to see the larger of the two quarries on the route, continue straight ahead when you come out of the sunken lane. Continue along the ridge and do not descend towards the valley on the right. Head for the quarry where, at the bottom, you will find a sunny or shady sandy area where you can have your picnic.

(2) Turn back. To continue the route, take the sunken lane by turning right. Stay on the sunken lane, ignoring the small paths on the right, and reach the second quarry on the route, which is the most beautiful.

(3) At the other end of the quarry, take the exit where the sandstone used to be transported. Go straight ahead at the crossroads and join the next one directly below a power line.

(4) At this fork, take the left path for the shortest route (there is an alternative route on the right, see § During the hike or nearby). Directly below a high-voltage power line, take the right path to avoid climbing up onto the plateau.

(5) Continue diagonally to the right towards the D95.

(6) Before reaching the road, take the small path on the left (horse field on the right). Then continue straight ahead through the woods.

(7) Turn right at a sharp angle. Cross the D94 and continue straight ahead on Rue d'Ors. Continue until you see the sign for "Moulin d'Ors". Turn right, pass in front of the Château d'Ors farm and leave the site via a small path on the right.

(8) About 50 metres further on, turn onto the path on the left. Pass under the Gar bridge and take the path on your left until you reach the forest path on a mound of earth. Turn right and follow this path to Moulin des Vassaux.

(9) Continue along the path. Keep right at the three-way junction to reach a staircase leading to a road, which you must cross. Continue straight ahead, cross the footbridge to cross the marshes and come out onto a street (Route de Billehou).

(10) Turn left, then right after 20 metres into Impasse de la Fontaine Billehou. Continue along the path, take the first path on the right to cross the two branches of the Mérantaise. After crossing the river, join the D95 (Route de Châteaufort), cross with caution and continue straight ahead on Chemin du Fond de la Cure. Continue straight ahead at the crossroads.

(11) At the end, you can turn right or left (choice of route) to cross a precarious passage made of stones or logs. Turn right immediately and go back up to the starting car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 153 m - Buisson basin car park
  2. 1 : km 0.43 - alt. 151 m - Three-way junction
  3. 2 : km 0.57 - alt. 149 m - East Quarry
  4. 3 : km 0.85 - alt. 148 m - North Quarry
  5. 4 : km 1.22 - alt. 150 m - Optional fork to the right
  6. 5 : km 1.43 - alt. 140 m - Turn right
  7. 6 : km 1.82 - alt. 108 m - Fork to the left
  8. 7 : km 2.57 - alt. 117 m - Turn right towards the Mérantaise (stream), a tributary of the Yvette.
  9. 8 : km 3.15 - alt. 105 m - Pont du Gar
  10. 9 : km 4.37 - alt. 93 m - Moulin des Vassaux
  11. 10 : km 5.32 - alt. 87 m - Route de Billehou
  12. 11 : km 6.62 - alt. 125 m - Fork to the left
  13. S/E : km 7.18 - alt. 153 m - Buisson basin car park

Notes

Park at the Buisson basin car park.

Avoid taking this route if it has rained in the previous weeks. The clay soil in some parts of the route could dirty your shoes or be slippery.

Parts of this route are also used by horse riders. If you are afraid of horses or have aggressive dogs, you may find this route unpleasant.

It may be possible (to be confirmed) to climb the unused sandstone walls of the quarry (3) in particular.

Please note: the aerial section of the route is shared with an air corridor used by light aircraft flying over the Chevreuse Valley. In addition, part of the route is close to the D95 motorway, where vehicles with powerful engines can be heard... On some days, you may experience noise disturbance on part of the route.

Worth a visit

(2) and (3) Old sandstone quarries where only sand remains. Picnics are possible.

For more information about these quarries

Period photos: this one and this one

(4) Alternative: the path on the right is longer but less steep. In this case, go to the end of the path and turn left to rejoin the main route.

If you have young children, I recommend a mini-route: from the start (S/E), just go to (2) or (3), have a snack, play and then turn back. They will find a sea of fine sand and some sandstone blocks from the old quarry to climb on!

More information about the Orce (or Ors) estate
About the Ors mill

The castle destroyed in 1951

The ice house

More information about the Vasseaux mill

Reviews and comments

3.8 / 5
Based on 10 reviews

Reliability of the description
3.7 / 5
Ease of following the route
3.7 / 5
Route interest
4.1 / 5
Relonnor
Relonnor

Overall rating : 3.7 / 5

Date of your route : Aug 18, 2025
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful and enjoyable hike.

Please note that it is better to rely on the map than the description:
important junctions (or crossroads) are not mentioned, and there are topographical errors (at (4) "turn right downhill to stay on the plateau" is more appropriate than "turn right to avoid going up onto the plateau"). The high-voltage power line is at (4) and not at (3), and the "mound of earth" at (8) is actually a collapsed low wall.
I would remind you that a good third of the walk (between (3) and (7)) is very uneven and includes numerous descents and ascents that are not clearly visible on the topographical curve. The alternative route is indicated if there are any physical problems.

The trees across the paths have all been moved or have disappeared (August 2025).

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User 16797947

Overall rating : 3.3 / 5

Date of your route : May 16, 2025
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

Difficulties finding the paths, no colour markings on the trees, almost impossible without GPS.
Woods cutting into the paths and blocking the way. I found another route that runs alongside the houses in Le Buisson and avoids the difficult section from 1 to 6.

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sylvene
sylvene

Overall rating : 3.7 / 5

Date of your route : May 31, 2025
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant hike, mainly through forest.
However, there are a few difficulties.
In some places, the path disappears due to logging and fallen trees. There are several logging tracks, so you will need a GPS to find the right direction.
The description is very vague in some places.
A GPS is essential.

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mmlecardonnel
mmlecardonnel

Overall rating : 5 / 5

Date of your route : Sep 22, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk, without any difficulties, but the path is already quite wet in September!

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Gif2
Gif2

Overall rating : 4.7 / 5

Date of your route : Jul 16, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very interesting hike. However, we came across a sign from a horse owner prohibiting access to the path. We had to find a detour and walk a little along the road towards Chateaufort. A little muddy at times.

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Alain78
Alain78

Overall rating : 4 / 5

Date of your route : Jul 22, 2024
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Personally, we had a bit of trouble following the route between points 4 and 6. We only took the description and the map with us, without any digital assistance. The path to take is barely visible. The Gar bridge is very interesting. A very pleasant hike.

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TechnicianCookie
TechnicianCookie

Overall rating : 2 / 5

Date of your route : Jun 09, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★☆☆☆☆ Very disappointing
Route interest : ★☆☆☆☆ Very disappointing
Very busy route : No

Passage between points 4 and 5 not maintained and impassable. Tree fallen across the path, which is too narrow and overgrown with brambles and beehives. Turn back required.

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ovil
ovil

Overall rating : 3 / 5

Date of your route : Feb 13, 2024
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : No

We wanted to combine this route with the one called "La Forêt de la Tête Ronde et le Bois de Saint Aubin" (The Tête Ronde Forest and Saint Aubin Woods) via Gif sur Yvette.
So we started from point 1.
The text is unclear from the Ors estate onwards. I didn't see a path on the left after the Gar bridge.
So I continued along this path and turned left when I reached a river. A narrow, muddy path follows this river and we came to a road. A motorist redirected us and we reached Villiers le Bâcle by following the road.

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Odile_Chouville
Odile_Chouville

Overall rating : 4.7 / 5

Date of your route : Feb 05, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Hike taken in early February. Several paths were very muddy. Walking sticks recommended to avoid slipping.

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guyleb
guyleb

Overall rating : 4.3 / 5

Date of your route : Feb 04, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A small error in the name of the starting point: it is the Buisson basin (not Busson).

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