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

n°7666769
Creation:
Last update:
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  • Walking
    Activity: Walking
  • ↔
    Distance: 4.46 mi
  • ◔
    Average duration: 2h 15 
  • ▲
    Difficulty: Easy

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 266 ft
  • ↘
    Descent: - 269 ft

  • ▲
    Highest point: 509 ft
  • ▼
    Lowest point: 269 ft

Photos

Description of the walk

Park in the Bassin de Buisson car park.

(S/E) On the left-hand side of the Cure, there is a green metal forest gate. Take the path leading into the forest and ignore the turn-offs to the left.

(1) Your path will cross a sunken lane. If you’d like to see the larger of the two quarries on the route, continue straight ahead along the path as you emerge from the sunken lane. Carry on along the ridge and do not head down towards the valley on the right. You’ll reach the quarry, where, at the bottom, you can find a sandy spot in the sun or shade to have your picnic.

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

(3) At the far end of the quarry, take the exit from which the sandstone used to be extracted. Head straight on at the junction and proceed to the next one directly beneath a power line.

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

(5) Continue, veering to the right towards the D95.

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

(7) Turn sharply to the right. Cross the D94 and continue straight on along Rue d’Ors. Carry on until you see the sign for ‘Moulin d’Ors’. Turn right, walk past the Château d’Ors farm and leave the grounds via a small path on the right.

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

(9) Continue along the path. Keep to the right at the three-way junction to reach a flight of steps leading to a road, which you must cross. Carry on straight ahead, cross the footbridge over the marshes and emerge onto a street (Route de Billehou).

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

(11) At the end of the track, you have the choice of turning right or left (depending on the route you’ve chosen) to cross a precarious path made of stones or logs. Turn right immediately and head back up to the starting car park (S/E).

Waypoints

  1. S/E : mi 0 - alt. 502 ft - Buisson Reservoir car park
  2. 1 : mi 0.27 - alt. 495 ft - Three-way junction
  3. 2 : mi 0.36 - alt. 489 ft - East Quarry
  4. 3 : mi 0.53 - alt. 486 ft - North Quarry
  5. 4 : mi 0.76 - alt. 492 ft - Optional turn-off to the right
  6. 5 : mi 0.89 - alt. 459 ft - Turn right
  7. 6 : mi 1.13 - alt. 354 ft - Turn left at the fork
  8. 7 : mi 1.6 - alt. 384 ft - Turn right at the junction towards the Mérantaise (stream) – a tributary of the Yvette
  9. 8 : mi 1.96 - alt. 344 ft - Pont du Gar
  10. 9 : mi 2.72 - alt. 305 ft - Moulin des Vassaux
  11. 10 : mi 3.31 - alt. 285 ft - Route de Billehou
  12. 11 : mi 4.12 - alt. 410 ft - Turn left at the fork
  13. S/E : mi 4.46 - alt. 502 ft - Buisson Reservoir car park

Notes

Park at the Bassin de Buisson car park.

Avoid taking this route if it has rained in the preceding weeks. The clay-rich soil in certain parts of the route may get your shoes dirty or be slippery.

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

There may be an opportunity (to be confirmed) to go rock climbing on the unexploited sandstone faces of the quarry (3) in particular.

Please note: the section of the route at head height coincides with the flight path of light aircraft flying over the Chevreuse Valley. Furthermore, a section of the route runs close to the D95, where motor vehicles tend to rev their engines… On some days, you may therefore experience noise disturbance along part of the route.

Worth a visit

(2) and (3) Former sandstone quarries where only sand remains. Suitable for picnics.

For more information on these quarries

Historical photos: this one and this one

(4) Alternative route: the path on the right offers a route that is certainly longer but less steep. In this case, follow the path to the end and turn left to rejoin the main route.

If you have young children, I recommend a short walk: from the start (S/R), simply walk to (2) or (3) and back; have a snack, play, and then head back the way you came. They’ll find a sea of very fine sand and plenty of opportunities to climb the remaining sandstone boulders from the old quarry!

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

The castle, destroyed in 1951

The ice house

More information on 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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