Balade dans le Bois de Perthe

Du château d'Ermenonville à la Pierre Sorcière en passant par le Bois de Perthe.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 8.73 mi
  • ◔
    Average duration: 4h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 322 ft
  • ↘
    Descent: - 302 ft

  • ▲
    Highest point: 400 ft
  • ▼
    Lowest point: 230 ft

Description of the walk

The walk starts at the car park in front of the castle entrance, on Rue René de Girardin, in Ermenonville.

(S/E) With your back to the car park, head right onto Rue Prince Radziwill, going uphill, then take the first street on the left, Rue Jean-Jacques Rousseau. At the next junction, keep left, pass the town hall and continue left, going uphill along the street to the pedestrian crossing. Cross over, take Rue Radziwill, walk past the school and arrive at the entrance to the cemetery.

(1) Turn left, walk past the church and the priory on your right. Cross the road and go down the street opposite (Rue de la Cavée) without going all the way to the end.

(2) Just before the end of this street, turn right onto a cobbled street, Chemin du Moulin, and after 250 m, you will reach a path on the right.

(3) Follow this path, keeping to the left along the edge of the woods and a stream (the Suret). Ignore a turn-off to the left (the three-way junction) and continue for about a hundred metres.

(4) Turn left (Chemin du Tourne-Bruyère); after 300 m, at the next T-junction, turn right and, at the end of this path, at another T-junction, continue left along the straight path until you reach a track at the Carrefour de Montagny.

(5) Take thethird path on the right (Chemin de Perthe), passing the remarkable tree known as the Ancêtre de Perthe, which is 37 metres tall and 250 years old: certainly the oldest oak in the forest. You will soon reach a cross-path at the 120-metre mark.

(6) Turn left at this T-junction and ignore the next two crossroads.

(7) At the third junction, take the path on the right, heading north-east, and continue to the next junction.

(8) Head left until you reach another junction.

(9) Wander a little through the rocks and sandy paths and, after completing a circular route, return to the previous junction.

(8) Turn left and, 200 m further on, turn left again onto a straight path. After 400 m, pass thefirst junction, a path on the left after 180 m, a path on the right after 100 m, and continue for another 200 m to a crossroads (located approximately 350 m before the D100).

(10) Turn left and rejoin the road. Leave it and turn left again, heading due west. Ignore the three paths on the right. The path curves to the left and reaches a junction (elevation 85).

(11) Turn right (Chemin du Roi) and further on, at the T-junction, turn left onto the straight Chemin de Baron. Pass a crossroads and arrive at a star-shaped junction with multiple directions.

(12) Head due south along the second path on the left (Chemin du Chêne Penché) and reach the Carrefour de la Croix Marchand.

(13) Turn left, south-east, onto the second path (Route de Montmagny). Ignore a turn-off to the right (Route des Bons Amis) and continue straight on until the next star-shaped junction (Carrefour de la Basse Corde).

(14) Head due south, taking the second path on the right, pass the Pierre Sorcière on your left, then cross a track (Route du Regard) and reach the three-way junction.

(15) Turn right onto Route de Perthe. Much further on, at the T-junction, follow Chemin du Moulin to the left and cross the stream to reach a fork you passed on the way out.

(3) Carry straight on in the opposite direction to the outward journey and reach another fork, which you also passed on the way out.

(2) Turn right (Rue de la Cavée) then immediately left (Rue Souville) and carry straight on until you reach the car park on Rue René de Girardin (S/E).

Waypoints

  1. S/E : mi 0 - alt. 259 ft - Car park in the village of Ermenonville. Near the - Launette (rivière) - Affluent de la Nonette
  2. 1 : mi 0.25 - alt. 328 ft - Church Square
  3. 2 : mi 0.42 - alt. 272 ft - Village circular junction
  4. 3 : mi 0.58 - alt. 269 ft - The River Suret. Junction 2 of the circular loop
  5. 4 : mi 1.14 - alt. 292 ft - Tourne Bruyère Path
  6. 5 : mi 1.82 - alt. 390 ft - Montagny crossroads. Perthe path
  7. 6 : mi 2.14 - alt. 390 ft - L'Ancêtre de Perthe. Fork in the path
  8. 7 : mi 2.55 - alt. 387 ft - Le Gilbois
  9. 8 : mi 2.79 - alt. 384 ft - Crossroads of the circular loop
  10. 9 : mi 2.94 - alt. 325 ft - Rocks and paths
  11. 10 : mi 4.09 - alt. 374 ft - Top of the Planted Woods
  12. 11 : mi 5.34 - alt. 279 ft - King’s Path
  13. 12 : mi 6.38 - alt. 233 ft - Chemin du Chêne Planté
  14. 13 : mi 6.91 - alt. 240 ft - Croix Marchand crossroads
  15. 14 : mi 7.21 - alt. 282 ft - Basse Corde crossroads. The Witch's Stone
  16. 15 : mi 7.79 - alt. 390 ft - Three-way junction of Patte d'Oie. Route de Perthe
  17. S/E : mi 8.73 - alt. 259 ft - Car park in the village of Ermenonville

Notes

Some sections of the route are not signposted; please ignore the markings.

Worth a visit

Ermenonville Castle.
Ermenonville Town Hall and Church.
Ermenonville Forest The Ancêtre de Perhe: 37 metres tall and 250 years old. Undoubtedly the oldest oak in the forest.
Climbing rock.
Pond.
Croix Marchand.
The Witch's Stone.

Reviews and comments

3.3 / 5
Based on 6 reviews

Reliability of the description
3.2 / 5
Ease of following the route
2.8 / 5
Route interest
3.8 / 5
MBERARD
MBERARD

Overall rating : 4.3 / 5

Date of your route : Apr 19, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely walk, enjoyed in perfect weather; judging by certain sections, the route must be tricky after periods of rain.
The rocky area between 8 and 9 is magnificent, and with the Visorando app, we were able to stray from the route.
The section between 11 and 13 is a bit monotonous

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LenaSand
LenaSand

Overall rating : 4.3 / 5

Date of your route : Mar 04, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant walk through varied landscapes (along field edges, through sparse or dense woodland depending on the area), with easily navigable paths. We found our way easily using the map.
Don’t miss the spots marked 8 and 9 – there are some beautiful rocks and a mini sea of sand. However, the first path marked to get there no longer seems to exist, so take the next one (which means a bit of a detour but it’s well worth it).
Thank you for this route

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Claude A.
Claude A.

Overall rating : 4.3 / 5

Date of your route : Mar 05, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely walk in the Ermenonville forest in the spring sunshine. No signposts, but easy to follow using the app.
We went for a walk during the week and only came across five other walkers.
We recommend it.

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gege0697
gege0697
• Edited:

Hello, I couldn’t find it either. I think I’ll correct that information I found online. Thanks for letting me know, Gérard

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fdigne
fdigne

Hello
I walked part of this route last April and we couldn’t find Perthe’s ancestor at the indicated spot. Does it still exist and is it really in that location?
Thank you
François

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Zumba_92
Zumba_92

Overall rating : 3.7 / 5

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

A lovely walk through the forest and across some fields with varied vegetation. The only major drawback is that there are no signs on-site indicating the names of the paths (which makes the route description rather impractical); you really need to be able to read and follow the map, rely on your sense of direction, and use the plot numbers when you come across them. The route description is very poor, even disastrous (examples: ‘Head due south’ – but you’d need a compass to find south in a forest… and without the sun!!!; ‘Leave the paths on the left and right until you reach a crossroads about 350 m before the road (D100)’). How are you supposed to know there’s a road 350 m away???
Not all paths are marked on the map, particularly around points 8 and 9

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Denis26
Denis26 ★
• Edited:

Hello there, hehe,
Sorry you weren’t able to go on this hike. I understand why you had trouble finding your way, as the route was initially described in the opposite direction to the GPS track. I’ve just corrected this error.
As for signposting, the walks described on the site don’t necessarily take this into account and may follow unmarked paths.
Kind regards,

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Marc Moissat
Marc Moissat

Overall rating : 1.3 / 5

Date of your route : Mar 28, 2024
Reliability of the description : ★☆☆☆☆ Very disappointing
Ease of following the route : ★☆☆☆☆ Very disappointing
Route interest : ★★☆☆☆ Disappointing
Very busy route : No

…it doesn’t really appeal to me…

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hehe
hehe

Overall rating : 1.7 / 5

Date of your route : Mar 28, 2024
Reliability of the description : ★☆☆☆☆ Very disappointing
Ease of following the route : ★☆☆☆☆ Very disappointing
Route interest : ★★★☆☆ Average
Very busy route : No

A walk where you get lost right from the start. It’s almost impossible to follow the signs. You never know where to turn.
There are yellow markers, but they don’t match the route.
In short, this walk is a bit of a disaster. Luckily we came across a horse rider who helped us.
A walk to avoid.

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