La Garenne de Villemartin and the polisher of Notre-Dame des Prés

A circular route that alternates between ascents and descents in the undergrowth, crossing a cultivated plateau and walking through a residential area. A detour allows you to visit a Neolithic polisher.

Details

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Creation:
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  • Walking
    Activity: Walking
  • ↔
    Distance: 12.14 km
  • ◔
    Average duration: 3h 45 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 97 m
  • ↘
    Descent: - 92 m

  • ▲
    Highest point: 155 m
  • ▼
    Lowest point: 66 m

Photos

Description of the walk

Departure from the Jean Coulombel sports complex, clearly signposted in the village of Morigny-Champigny and equipped with a large car park.

No signposts

(S/E) At the car park exit, take the cycle path on the right, which runs parallel to Avenue du Général de Gaulle (D17). At the playground, step over the safety barrier and cross the road (with caution). On the other side, pass a sign for "Site géologique de l'Essonne" on your right and follow a field path. At the end, turn right and stay on the edge of the woods. Further on, walk along the garden fences on your right. At an intersection (sign for "Private Property" on the left), continue straight ahead and you will immediately find the Notre-Dame des Prés polisher on your right (information sign).

(1) Retrace your steps back to the sports complex car park.

Yellow markings +PR®37signposts
The markings are in both directions, but the signs are one-sided, in the direction of this description.

(S/E) Continue south on the cycle path (on the left as you leave the car park if you have not made the return trip to the polisher). At the entrance to Morigny-Champigny, cross the D17 at the pedestrian crossing to follow the cycle path on the right-hand side of the road (the left-hand side is very narrow).

(2) After about 100 metres, turn left onto Rue du Mississippi. To do this, cross the D17 again, with two options:
- at the intersection if there is no traffic, as shown on the map (be careful);
- a little further on at the pedestrian crossing, as indicated by the signs (in this second case, walk back a few metres).
Walk up Rue du Mississippi for about 200 metres.

(3) At the last house on the left, turn right. At the crossroads that immediately follows, take thesecond path on the left, pass a small house on your left and enter the woods. Pass under a power line and ignore a path on the right and then one on the left. Continue steadily uphill on the wide path, ignoring a few mountain bike tracks on either side. Just after crossing a path coming from the left, you will come to a crossroads at the edge of a field.

(4) Then turn left, stay in the woods for another 150 metres or so and continue north-east along the edge of the woods.

(5) At the crossroads at the edge of the woods, turn right onto the main path and head north-east between the fields.

(6) At the next crossroads, turn left towards a wood and walk north-east between the fields. At the edge of the wood, continue in the same direction along the edge and walk alongside a field on your right. Ignore the paths on the left (private property) and an access tothe GR®11on the right.

(7) At the corner of the field, enter the Bois de la Barre, where the wide path gives way to a trail. Wind your way through the undergrowth and ignore all the paths branching off to the sides (private property on the left). Then descend slightly between mounds of mossy sandstone paving stones (old quarries). At the bottom, ignore a path coming from the left, step over a low fence (to keep small game in the woods?) and immediately come out onto the D17 at a place called Les Croubis.

(8) Cross the road (take care) and continue straight ahead for less than 100 metres. In front of a metal barrier, turn left and follow a path between garden fences on the left and a ruined wall on the right. Further on, continue with a hedge on your right, then a wood.

(9) At the crossroads, continue south on a one-way street (Rue de Champigny, as indicated by a sign further on). Cross Rue Traversière (!) and continue straight on Rue de Villemartin, ignoring the dead ends on either side.

(10) At the end (gate with turrets), turn left onto Allée des Marronniers. At the stop sign, cross the D17, either immediately if there is no traffic, or at the pedestrian crossing to the right. Follow Chemin du Moutoir de Villemartin, slightly uphill, between a field on your left and the hedge of a housing estate on your right.

(11) At the foot of an electricity pylon, turn right, go through a forest gate and follow a path parallel to the power line. At the next pylon, turn left to enter a wood. Walk along with a fence on your left. Immediately after passing a forest gate, you will come to a crossroads.

(12) Turn right at an acute angle. Walk along the fence of an old quarry on your right. At the end of the fence, continue along a small gravel road and ignore all the side roads. Pass under the power line, turn right immediately and you will come to the intersection you took on the way there.

(3) Continue straight ahead on Rue du Mississippi. At the stop sign, cross the D17.

(2) Follow the cycle path to the right to the sports complex car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 71 m - Jean Coulombel sports complex
  2. 1 : km 0.57 - alt. 66 m - Polissoir de la Petite-Garenne (Morigny-Champigny)
  3. 2 : km 1.39 - alt. 75 m - Route D17 x Rue du Mississippi
  4. 3 : km 1.6 - alt. 82 m - Crossroads of the circular loop
  5. 4 : km 2.98 - alt. 144 m - Crossroads at the edge of a field
  6. 5 : km 3.94 - alt. 149 m - Crossroads at the edge of a wood
  7. 6 : km 4.4 - alt. 155 m - Crossroads between fields
  8. 7 : km 5.96 - alt. 142 m - Bois de la Barre - Chemin aux Anes
  9. 8 : km 6.91 - alt. 72 m - Les Croubis - Route D17
  10. 9 : km 8.05 - alt. 72 m - Rue de Champigny
  11. 10 : km 9.02 - alt. 67 m - Clos de Villemartin
  12. 11 : km 9.73 - alt. 88 m - Intersection (electric pylon)
  13. 12 : km 10.66 - alt. 91 m - Fork
  14. S/E : km 12.14 - alt. 71 m - Jean Coulombel sports complex

Notes

Hiking boots are recommended.

No water sources or shops along the route.

The marked section of this hike follows the PR®37 "Les Croubis" trail, designed and maintained by the Essonne departmental committee of the FFRP (French Federation of Hiking). The markings are excellent (as of March 2019) but non-existent between points (5) and (7) due to a lack of support. A 1:25,000 map is recommended (at least the one accompanying this description).

Variants:
- The return trip to the polisher (1) can be undertaken at the start of the hike, as described, or of course at the end.
- If you choose to skip this return trip, the hike will be approximately 1.1 km shorter.

Additional information:
This hike can be combined with the "Petites boucles de Morigny-Champigny" circular hike, which starts in the same town, about 1.3 km from the start of this hike. Plan to transfer by car and allow for about 20 km for the entire hike.

Hike completed by the author on 16 March 2019.

Worth a visit

- At the start of the access path to the polisher, after crossing the D17 between (S/E) and (1), you can see a geological cross-section on the right that is part of the Essonne Geological Sites.
- Notre-Dame des Prés polishing stone (1), dating back 6,000 years.
- Pleasant forest path between (3) and (4).
- Descent between mounds of mossy sandstone paving stones (former quarry?) between (7) and (8).
- Gate with turrets at Clos de Villemartin (10).

Always be cautious and plan ahead when you're outdoors. Visorando and the author of this route cannot be held responsible for any accidents occurring on this route.

The GR® and PR® markings are the intellectual property of the Fédération Française de Randonnée Pédestre.

Reviews and comments

4.7 / 5
Based on 8 reviews

Reliability of the description
5 / 5
Ease of following the route
5 / 5
Route interest
4.1 / 5
alma91
alma91

Overall rating : 5 / 5

Date of your route : Mar 04, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

No particular difficulties.
See the polisher site, the quarry and the viewpoint.

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epiluc91
epiluc91

Overall rating : 4.7 / 5

Date of your route : Oct 17, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Nice hike. Good balance between country and forest trails. The polisher is of limited interest to those who are not fans of this kind of thing. The woods are very pretty at this time of year.

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ealet
ealet

Overall rating : 4.7 / 5

Date of your route : Mar 02, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

An interesting and varied route – don't miss the viewpoint (between 7 and 8, signposted).
The route is well described and easy to follow.
Thank you to the author for sharing this.

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Nonotgv
Nonotgv

Overall rating : 4.3 / 5

Date of your route : Jul 24, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

The nature part is very good.
The town, not so much.
The polisher is difficult to access. And crossing the road is not easy.
The view over the Juine valley is worth it.

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boucles d'or
boucles d'or

Overall rating : 5 / 5

Date of your route : Feb 16, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very pleasant walk through fields and the Barre Departmental Forest.
As for visitor numbers, there are quite a few people in the Barre Forest. But otherwise, there are very few people.
I didn't go to see the polisher. I walk with my dogs and climbing over the safety barrier wasn't at all safe.
It's impossible to get lost between the description and the very clear signage, so no worries.
Just to clarify, it's not the Barre woods but the Barre Departmental Forest. Don't hesitate to climb up to the viewpoint (which is on the left), it's just magnificent.
Another beautiful hike.

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ovil
ovil
• Edited:

Overall rating : 4.7 / 5

Date of your route : Dec 29, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

I merged this route with the one called "the little circular route of Morigny-Champigny", starting from Etrechy station. We started the hike at point 8. At point 3, we went down Rue de Villeneuve to reach Parc Saint Perier and complete a circular hike before returning to point 3 and finishing the hike. We therefore skipped the section between points 1 and 3.
We did the hike on a cool winter's day on beautiful paths that were sometimes muddy as we crossed fields following the recent rains.
As already mentioned, the Bois de la Barre was bequeathed to the Essonne department, which developed it in 2020 with information panels on the quarries and flora, a viewpoint with an orientation table, benches and a car park on the edge of the D 17.

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Netra
Netra ★

Thank you very much! I will include this detour in the hike.

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Philip93
Philip93

The path leading to the viewpoint starts at elevation 110 on the IGN map and ends at the high-voltage power line (where it forms an angle), under which the orientation table is located.
Kind regards.

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Netra
Netra ★

Hello Philip93, and thank you for your comments.

The question mark about the quarries has been removed.

Could you specify where "on the left-hand descent" the path leading to a viewpoint is located? Thank you in advance.

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Philip93
Philip93

A small addition:
The question mark can be removed from the description, as it is indeed an old quarry. Numerous information panels have been installed, and it can be seen just after the entrance to Chemin des Carriers (on the left) before starting the descent.
"Descent between mounds of mossy sandstone paving stones (old quarry?) between (7) and (8)."

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Philip93
Philip93

Overall rating : 4.7 / 5

Date of your route : Oct 18, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

An interesting route, but one thing to note: at the bottom of the descent (Chemin aux Ânes) leading to the D17, there is no longer a net (which was used to prevent toads from crossing the road and being run over) because a small car park has just been built by the local council, as the Bois de la Barre, which was originally private property, has been bequeathed to it. It was inaugurated on 10 October. Please note: on the left-hand side of the descent, a path covered with bark has been created to provide access to a magnificent viewpoint over the Juine valley, and an orientation table has even been installed there.

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randodansesetloisirs
randodansesetloisirs

Overall rating : 4.7 / 5

Date of your route : Apr 29, 2019
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good

Pleasant, varied hike. Large car park with space for groups. It's worth making a short detour to see the polisher.

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