The Rocher Mignot and the Marais d'Itteville

Discover some geological and natural sites in the south of the Essonne department: a landscape of flat land, a sandpit and a vast marshland area that is home to many birds. This hike alternates between sections in the undergrowth, which are the most numerous, and sections between fields.

This walk is part of a multi-day hike: En suivant la Juine

Details

521247
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 13.03 km
  • ◔
    Average duration: 3h 55 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 82 m
  • ↘
    Descent: - 87 m

  • ▲
    Highest point: 148 m
  • ▼
    Lowest point: 54 m

Photos

Description of the walk

Start from the car park of the Noyer Courteau municipal hall (large green-clad building) along the D99.

Yellow signposts

(S/E) With your back to the large building, turn left (west) along the D99. After about 100 metres, at Rue des Champs on the right-hand side, turn left (south) onto a farm track. At the next junction (yellow signs with two sides), turn left.

Yellow + blue markings

(1) At the T-junction, turn right. Pass a pumping station on your right and continue straight ahead towards a wood. After about 100 metres, at a fork (not shown on the map), turn left.

(2) Ignore a path that branches off to the right into the woods and stay on the edge. After about 150 metres, enter the woods. At the fork that appears immediately, turn left and stay inside the woods but on the edge. Further on, turn right, enter the woods and climb steeply.

Yellow markings

(3) At the top of the hill, turn right. Wind your way along a flat path with small rocks protruding from the ground, ignoring vague trailheads on the right. Note the boulders below on the right and finish in a flat landscape.

(4) At the three-way junction, turn left (south-southwest). Leave the woods, pass under the high-voltage line and continue south, keeping parallel to it.

Yellow + red and white markings

(5) At the T-junction, turn left (ignore a yellow arrow pointing to the right; twoPR® trails intersect here). Follow theGR®1, ignoring the trails branching off to the sides, and enter the woods again. Continue along the edge of the woods on your right. At a large intersection, turn left and continue along the edge of the field on your left.

Yellow markings (rare)

(6) At the next junction, turn left (north-east) along the edge of the woods (let theGR®1continue straight ahead into the woods). Continue between the fields, ignore a path on the left and take the first path on the right (a wide grassy path heading south-east). Ignore a path on the left, enter the woods again and descend slightly.

(7) At the bottom (yellow sign with two sides), turn left at an acute angle. At the next fork, turn left. Turn right with the path and ignore a path on the left. Further on, walk along the edge of the woods on your left, then enter the woods.

Yellow + blue markings

(8) At the fork, turn right. Walk north-east and ignore all paths branching off to the sides, alternating between the undergrowth and the edge of the woods on your left. Start to descend and, at a crossroads, continue straight ahead and continue downhill on a wide path that quickly becomes stony.

(9) Note the Sablière d'Orgemont on your right and continue straight ahead on the path of the same name (tarmac road). Cross the Chemin des Glands on your right and descend with two successive bends. Cross the Chemin Potier.

Yellow signpost

(10) At a signpost, continue straight ahead on the tarmac (ignore the blue sign and the yellow sign for a secondPR® trail that branches off to the right). Cross the D449 at the pedestrian crossing on the left and take the Rue de la Porte de Bouray diagonally to the right (bus shelter on the right). Ignore Rue des Faubourgs on the right and, at the next crossroads (cross), turn left and go down Rue Saint-Germain. Pass an old well on your right and, at the next fork, turn left onto Rue Forget. Cross Chemin de l'Enfer, continue on Chemin du Robinet and you will come to a small car park (information sign).

Yellow + bluesignposting

(11) Continue straight ahead and go through a metal gate. Walk along a pond on your left until you reach a crossroads (pasture on the left).

(12) Follow the path on the right, which is stabilised with wood chips (not shown on the map). Walk alongside a river on your left and note the view of Itteville church on your right. Ignore a path coming from the right and continue straight ahead to the Aveau observatory. Retrace your steps back to the crossroads.

(12) Turn right, pass a few small rocks across the path, follow the pasture fence on your left and arrive at the Fauvettes observatory. Retrace your steps to the crossroads.

(12) Continue straight ahead (south) and pass through the metal gate again.

(11) With your back to the gate, turn right (west) and follow a farm track along the edge of the field on your left. Pass a small house on your left.

Yellow signpost

(13) At the next intersection (signpost), continue straight ahead on the farm track (ignore the blue sign and the yellow sign for a secondPR® trail that branches off to the left onto a field path). Walk along the edge of the woods, following the fences and ignoring a path that branches off to the right towards the Juine River. Continue along the edge of the field on your left, then follow a fence on your right at a short distance. The path narrows and runs strictly alongside the fence. At the end of the fence, continue slightly to the left into a wasteland, then enter a wood.

(14) Go through a forest gate and follow the D449 road to the right: either on the left-hand shoulder, which is unfortunately very narrow, or on the right-hand shoulder, which is wider with a marked path along the wall of a property. At the roundabout, turn left onto the D99 towards Lardy and you will quickly reach the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 75 m - Parking at Noyer Courteau
  2. 1 : km 0.95 - alt. 74 m - T-junction between the fields
  3. 2 : km 1.69 - alt. 82 m - Fork in the path at the edge of the woods
  4. 3 : km 2.44 - alt. 130 m - Summit
  5. 4 : km 3.41 - alt. 131 m - Three-way junction
  6. 5 : km 3.95 - alt. 129 m - T-junction - junction with the GR1
  7. 6 : km 4.88 - alt. 146 m - Fork in the path
  8. 7 : km 5.75 - alt. 133 m - Crossroads
  9. 8 : km 6.75 - alt. 140 m - Fourche
  10. 9 : km 7.82 - alt. 119 m - Orgemont sandpit
  11. 10 : km 8.38 - alt. 75 m - Start of the trail
  12. 11 : km 8.93 - alt. 56 m - Access to the Marais d'Iteville
  13. 12 : km 9.13 - alt. 55 m - Crossroads near - Marais d'Itteville
  14. 13 : km 10.6 - alt. 55 m - Intersection
  15. 14 : km 12.22 - alt. 72 m - Route D449
  16. S/E : km 13.03 - alt. 75 m - Parking at Noyer Courteau

Notes

Hiking boots required.

No water sources identified along the route.

The Marais d'Itteville is a protected natural area (Natura 2000): respect the site and follow the instructions on site.

A 1:25,000 map is useful (at least the one accompanying this description).

Hike completed by the author on 26 March 2017.

Worth a visit

- Landscape of the former peat bog (4).
- Orgemont sandpit (9). This sandpit is part of the Essonne geological nature reserve. In March 2017, the site was being developed with a barrier, access path and information board.
- Croix de la bascule, after (10).
- Itteville marshes with bird observatories, after (12).

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

4.6 / 5
Based on 36 reviews

Reliability of the description
4.8 / 5
Ease of following the route
4.9 / 5
Route interest
4.2 / 5
Oliv'91
Oliv'91

Overall rating : 5 / 5

Date of your route : Mar 22, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant, varied and relaxing walk.
No difficulty with this route.
Thank you for the very clear details.

Machine-translated

leroy isabelle
leroy isabelle

Overall rating : 5 / 5

Date of your route : Mar 15, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A lovely walk. Excellent explanations

Machine-translated

Natacha91
Natacha91

Overall rating : 5 / 5

Date of your route : Feb 02, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant walk through woods, fields and a small village. The last 500 metres are along a busy road, but it's over quickly. You can take the paths through the fields to bypass the starting point and reach the car park.
The view of the ponds is very relaxing. Thank you.

Machine-translated

User 4361773

Overall rating : 4.7 / 5

Date of your route : Oct 15, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A few comments following the reconnaissance of this hike. At marker 4, don't forget to take the small path towards Rocher Mignot to enjoy the view, even if a large electricity pylon spoils the landscape a little. One person mentioned not having a view, so they must have followed the route without making this detour. Between markers 10 and 11, instead of walking along Rue Forget, turn left onto Chemin de l'Enfer, which winds its way through the gardens, then turn onto Chemin du Robinet as planned. At marker 12, we continued on to the Blongios observatory before retracing our steps and walking towards the Aigrettes observatory. Finally, at marker 14, after walking along the grounds of Château de Frémigny, turn right at the crossroads and then left onto Rue d'Aquitaine. Follow this road until you turn onto Rue de Provence, which avoids the very unpleasant and dangerous return trip on the main road. You will arrive directly at the traffic lights serving the car park.
The total distance is 14.2 kilometres. With these small changes, the hike is very varied: woods, fields, marshes and sand pits. We saw some beautiful Highland cows on the marsh path.

Machine-translated

User 2202174

Overall rating : 4.3 / 5

Date of your route : Aug 19, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

No worries about parking, there's plenty of space
There's no need to search around, everything is clearly signposted and pleasant.
However, in ITTEVILLE, apart from the tarmac, you need to be careful in the village when turning left to reach the lake, as there is no visibility. The person in charge should stay on the right to ensure the safety of their group.
Towards the exit, before returning to Bouray-sur-Juine, we find ourselves on the edge of the D449, a busy road. There is no pedestrian crossing at the crossroads (so it's up to us to be careful) and to continue, we have to stay on the side of the road, about 50 cm away from the edge, to reach our random and unsafe starting point. (I admit that the grass had not been cut.)
For your information, at the roundabout, I turned right and took a village road to return to my starting point (the final route needs to be reviewed)
Apart from these hazards, the route is very pleasant
I plan to do it again in September with my group
Best regards,

Machine-translated

digit29
digit29

Overall rating : 4.3 / 5

Date of your route : Sep 16, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

It's an interesting route to the Iteville marshes, but the return to the car park is less interesting
especially the end, which requires walking along the side of the road.
Overall, the route is pleasant.

Machine-translated

imagineformargo
imagineformargo

Overall rating : 4 / 5

Date of your route : Jul 24, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

An easy and pleasant hike on a sunny Sunday morning. Please note: point 7: sign on the ground. Point 13: "...follow a fence on your right..." At this time of year, the path is overgrown, forcing you to walk through the crops on your left. Point 14: the forest barrier is down and the passage along the D449 is not great.
Thank you for this route and for helping us discover the marshes.

Machine-translated

CHANNIE
CHANNIE

Overall rating : 4.7 / 5

Date of your route : Mar 31, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Unfortunately, we had to shorten the route because the weather became too bad (rain, wind, temperature) for our group of seniors, some of whom are frail. So we only did the first part up to point 8, where we turned back to the car park. As it had rained heavily the night before, the "field" section was muddy, but the forest was fine.
An interesting tour that we will do again when the weather is better!

Machine-translated

krando94
krando94

Overall rating : 4.5 / 5

Date of your route : Feb 12, 2022
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A very enjoyable hike overall. The last kilometre isn't particularly pleasant, as you walk along a busy road.

I did it in winter and didn't encounter many muddy sections (and those that were muddy were relatively easy to cross).

Machine-translated

mdre
mdre
• Edited:

Overall rating : 4.3 / 5

Date of your route : Feb 09, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Very busy route : No

A little disappointed because this hike is much more ordinary than the one along the banks of the Juine River starting from Lardy, despite the bright blue sky.
There were few people apart from a group of walkers who were bird watching and were easy to avoid.
A walk through fields and forests, a very easy hike.
The sandpit is interesting if you have a lot of imagination to visualise the crocodiles and rhinoceroses surrounding you!
the description is very accurate, so you can even do this hike without consulting a map

Machine-translated

leonisa14
leonisa14

Overall rating : 4.5 / 5

Date of your route : Jan 16, 2022
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A varied and easy hike. Very accessible in winter with paths that are not very muddy. A hat is essential to protect yourself from the bitterly cold wind at this time of year.

Machine-translated

cyrcava
cyrcava

Overall rating : 4 / 5

Date of your route : Jan 01, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful ride through fields and woods, with just one small detour that we recommend adding, which was pointed out to us by a mountain biker we met at just the right moment. It offers a view of Lardy, Bouray and the whole area. It is located at point No. 4. When you reach the fork, instead of continuing along the path to the left, turn right and go under the high-voltage power line. Then retrace your steps to resume the walk.

Machine-translated

catger25
catger25

Overall rating : 5 / 5

Date of your route : Nov 14, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very beautiful hike with beautiful views. The landscapes are varied (fields/flat areas/sand).
The very end is a bit long and monotonous along the fence, but this is nothing compared to the rest and there is no better option.
Definitely worth doing.

Machine-translated

LoloRoadRocker
LoloRoadRocker

Overall rating : 4.7 / 5

Date of your route : Nov 13, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

The paths are very well maintained and there are no difficult sections.
However, be careful on the last kilometre, which runs alongside a road that can be quite busy at certain times of the day.
The route is very pleasant and varied, passing through fields, forest and marshland.

Machine-translated

epiluc91
epiluc91

Overall rating : 4.7 / 5

Date of your route : Oct 14, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Easy and rather pleasant hike.
Be careful at point 7 (which is not at the bottom of the descent as indicated) because the yellow two-sided sign is lying on the left and is hardly visible when descending, especially as there is another one 50 m further down on the right-hand side, which is standing upright. But you are now at the junction with the GR 1 and you must turn back (and not turn left).

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.