A corner of the L'Isle-Adam Forest via the churches of Montsoult and Maffliers

A hike through the south-western part of the L'Isle-Adam Forest, where you will encounter some remarkable trees and beautiful heritage sites in Montsoult and Maffliers.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 13.27 km
  • ◔
    Average duration: 4h 15 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 168 m
  • ↘
    Descent: - 163 m

  • ▲
    Highest point: 184 m
  • ▼
    Lowest point: 95 m

Photos

Description of the walk

Starting point and access: Montsoult-Maffliers station.
- Transilien - Line K, on the sections between Paris-Nord and Persan-Beaumont or Luzarches.
Take the Place de la Gare exit on the side of platform 1. If you arrive on another platform, take the underground passage.

No signposts

(S/E) Cross Place de la Gare and take Avenue Fernand Fourcade opposite, towards the police station and the post office. Continue straight ahead, past the police station, up a gentle slope and past the post office. At the next crossroads, takethe second left, the D64 towards Maffliers, leaving the market on your left. Pass the town hall, turn right then left onto the D64, pass the church on your right and you will come to a roundabout.

(1) Then follow the D24 to the right. Take thefirst left, Rue aux Loups. Stay on this street, which turns right and then left.

Yellow markings

At the entrance to a hotel residence, continue straight ahead on a sunken path downhill. At the bottom, return to the tarmac, ignore a car park on the right and continue opposite Rue de la Ferme.

(2) At the roundabout, take thesecond right, Rue de la Forêt. At the end, turn left onto Rue Notre-Dame des Champs, and you will soon reach the church of the same name and the town hall/school. Turn right and walk alongside the church on your right.

No signposts

At the end of the church, turn right onto Rue du Four. At the crossroads, turn right and continue to the roundabout.

(2) Continue straight on the D64 towards L'Isle-Adam. It is best to use the pavement and then the right-hand shoulder for better visibility after leaving Maffliers ( n narrow shoulder). Turn into thefirst left, an access road to a riding centre.

(3) Immediately afterwards (earlier than the IGN map suggests), turn right onto a path blocked by a chicane made of large tree trunks. At a fork (not shown on the map), take the left-hand path. Cross several wet passages or go around them in the undergrowth, preferably on the left-hand side. After about 250 m, the path turns left (it does not continue straight ahead as shown on the IGN map).

(4) At the crossroads, turn right onto a wider, less wet path. At a fork (not shown on the IGN map), veer left. Pass by an isolated beech and oak tree and cross a perpendicular path. Go around a low wall on the left and you will come to a crossroads (plot no. 53). Then take a wide path to the north-west that starts behind a forest barrier and descend gently.

Yellow markings

At the crossroads (elevation 140), continue straight ahead and climb slightly. At the next crossroads, turn left onto a wide gravel path between plots nos. 51 and 49 (ignore the arrow of a secondPR® sign pointing to the right). Soon you will walk along a fence on your left.

No markings

(5) At the information panel about the Tilleul des Bonshommes, leave the path on the right, cross a stream via a footbridge and follow a path, leaving the lime tree and a pond on your right. Continue uphill on a wider path. At the top, note some beautiful beech trees. At the crossroads (plot no. 48), go straight ahead and note a pond some distance away on the right. At the next crossroads, continue straight ahead (bridle path) and descend.

(6) At the crossroads, turn sharply left (south) and continue downhill. At the next crossroads, continue straight ahead. Cross a very sparse forest, pass a forest barrier and come out onto the D9 road.

(7) Cross the road (take care), pass a chicane (plot no. 62) and continue along a path that winds through the undergrowth. Pass at the foot of a tree marked with plot no. 61 and continue straight ahead (south-west). This will take you to a crossroads (plots nos. 61, 62 and 64).

Yellow markings

(8) Turn left and, at the fork immediately ahead, take the right-hand path, which is the most obvious. Cross a clearing and walk along the right-hand side of a ditch with fields beyond. Ignore all the paths on the left. Enter the undergrowth again. Cross the ditch when it turns left and walk along the fence of a private property on your right.

No markings

(9) At a crossroads, go straight ahead and ignore the arrow pointing to the right (the IGN map is approximate here). Follow a grassy path north-northeast and ignore all the tracks on either side. Go through a forest gate and cross the D9 road again (take care).

Yellow markings

(10) Go through a metal gate and follow a tarmac lane which soon gives way to a wide gravel path. At the next crossroads, turn right between plots nos. 50 and 56. Go downhill, cross a stream and you will come to another crossroads.

(11) Follow thePR®IA3to the right. After a short descent, turn left (wet passage). Go up a path with a private property fence on the right-hand side. At a fork, turn right, still following the fence. At the next intersection, turn right again. Walk along an old ruined wall on your left, then pass under an old stone bridge. Pass through a metal gate and continue on the tarmac road.

(12) At the next intersection, turn sharply left and follow a path that enters the forest (plot no. 88). Soon turn right and, at the fork that appears immediately, take the path on the left in plot no. 88. At the next crossroads (elevation 173), take thefirst path on the right. Ignore a path on the right (house) and continue eastwards.

No markings

(13) At the stump on the left-hand side, take a very discreet path on the right (be careful to spot this start). Go downhill, go around a low wall on the right and come out onto a path (Sente de Derrière les Moulins on the map). Follow this path to the left, pass a bench and continue between two stone walls. Pass under a footbridge and continue between two walls. Pass under a second footbridge.

(14) At the next intersection, turn right between two fences and descend. Go through a wooden gate and note a manor house on the left. At the bottom (note the old presbytery opposite), turn left onto Rue de Pontoise and walk past the entrance to the manor house. At the Place des Tilleuls crossroads, turn left, still on Rue de Pontoise, to reach the roundabout opposite the church in Montsoult.

(1) Leave the church on your left and follow the D64 towards the station. At the roundabout at the corner of the market, take thesecond right, still on the D64 towards the station. Continue straight ahead until you reach Monsoult-Maffliers station (S/E).

To return home:
- Transilien - Line K, towards Paris Nord or Persan-Beaumont or Luzarches.

Waypoints

  1. S/E : km 0 - alt. 113 m - Gare de Montsoult-Maffliers
  2. 1 : km 1.17 - alt. 154 m - Roundabout - Église Saint-Sulpice (Montsoult)
  3. 2 : km 1.93 - alt. 156 m - Place Talleyrand-Périgord
  4. 3 : km 2.58 - alt. 158 m - Trail start
  5. 4 : km 2.98 - alt. 161 m - Crossroads
  6. 5 : km 4.44 - alt. 142 m - Tilleul des Bonshommes
  7. 6 : km 5.22 - alt. 136 m - Route aux Sangliers
  8. 7 : km 5.82 - alt. 117 m - Route D9
  9. 8 : km 6.74 - alt. 97 m - Crossroads 61/64
  10. 9 : km 8.57 - alt. 119 m - Crossroads
  11. 10 : km 8.94 - alt. 122 m - Carrefour Boucault
  12. 11 : km 9.83 - alt. 116 m - Crossroads
  13. 12 : km 10.91 - alt. 158 m - Start of the trail
  14. 13 : km 11.41 - alt. 181 m - Fork in the road
  15. 14 : km 11.67 - alt. 174 m - Intersection
  16. S/E : km 13.27 - alt. 113 m - Gare de Montsoult-Maffliers

Notes

Train timetables: check the Transilien website.

For motorists:
You can park in the station car park, located along Avenue Fernand Fourcade, shortly after (S/E). However, as the route between the station and Montsoult church is not particularly interesting, it is recommended that you park in one of the car parks along the route from the church (saving you around 2.4 km):
- Montsoult Church (1). Parking is limited to two hours, except on Saturdays, Sundays and public holidays.
- Rue de la Ferme, in Maffliers, just before (2).
- Carrefour Boucault (10).
- Place des Tilleuls, between (14) and (1).

Hiking boots are required. Very wet sections between (3) and (4). Wet and potentially muddy sections between (7) and (10) and between (11) and (12).

Recommendations:
- Due to the numerous wet sections, undertake this hike in dry weather.
- During the season (September-February), avoid Tuesdays, which are hunting days in the L'Isle-Adam National Forest.

No water sources identified along the route. Bakery and bar-restaurant at Place de la Gare (S/E).

Hike completed by the author on 21 February 2020.

Worth a visit

 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

4.2 / 5
Based on 14 reviews

Reliability of the description
4.1 / 5
Ease of following the route
4.2 / 5
Route interest
4.1 / 5
Albon
Albon

Parking at the station is free of charge.

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Patolihen
Patolihen
• Edited:

Overall rating : 4 / 5

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

A pleasant hike in a beautiful forest (especially at the beginning).
But I wanted to park in a paid car park on Avenue Fourcade at the start of the hike
But the machine didn't accept my payment, even though I had entered my number plate
As a result, I received a €35.00 fine...

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kingclauduis
kingclauduis

It's been five years since the hike was first proposed, so it's only natural.

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Albon
Albon

Overall rating : 3.7 / 5

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

The forest is ravaged in places towards the end
The route suggested at the end is somewhat unrealistic.

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libertysurf
libertysurf

Overall rating : 3.7 / 5

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

I really enjoyed this section of the Isle Adam forest, which is easily accessible from Montsoult station.
I had a little trouble between points 3 and 4, but also and especially when leaving the forest between 13 and 14.
Shortly before that, the path was quite damaged or tricky in places, so it's best to wear good footwear and pay attention.
A GPS is a welcome addition to help you get back on track.
In summary, a hike that is a bit challenging at times, but well worth the effort.

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michel.gordin
michel.gordin

Overall rating : 2 / 5

Date of your route : Oct 08, 2023
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★☆☆☆ Disappointing
Very busy route : No

A hike with a group of friends (8 people) that was very disappointing because we did a lot of walking on tarmac and in built-up areas, or on paths that were probably logging tracks rather than IGN paths, with signage that was mostly non-existent and very unclear explanations of the hike.
In short, a disappointing walk that fell far short of this site's usual standards.
The only plus points were a fairly pleasant forest and some beautiful trees.

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bernard951
bernard951

Overall rating : 5 / 5

Date of your route : Jun 11, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk through the woods, ideal in hot weather. Bring mosquito repellent for certain sections of the route through damp areas.

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ozogiminy
ozogiminy

Overall rating : 4.7 / 5

Date of your route : May 29, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A superb walk in the forest. Like others, I missed the parish-specific to Brittany discreet path, but I was able to pick up the trail again later on.
Ideal for hot weather and definitely best avoided during the wet season.

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Pingpong
Pingpong

Overall rating : 4 / 5

Date of your route : Jan 30, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

Often in the undergrowth => certainly very pleasant in summer.
I moved the start to the Boucault crossroads. Point 10
Slippery slope between 13 and 14. I took the path on the left.
It's a shame that quads and other motorbikes ruin the paths.

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Roberto Sanchez
Roberto Sanchez

Overall rating : 4.7 / 5

Date of your route : Sep 03, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Great description of the route with plot numbers, fences or low walls, etc.
An interesting route, especially as we didn't meet a soul.
Very nice weather, so we appreciated the cool shade under the trees

Highly recommended

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Kilomètres à pied
Kilomètres à pied

Overall rating : 5 / 5

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

We really enjoyed this hike, four-fifths of which takes place in the beautiful forest of Isle-Adam. Well done for the clear explanations, which are even more difficult to provide in a forest than in other places!

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nitche
nitche

Overall rating : 3.7 / 5

Date of your route : Sep 04, 2020
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

could not find the "very discreet path"

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kingclauduis
kingclauduis

Overall rating : 4 / 5

Date of your route : Sep 03, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Starting from Nerville la Foret instead of Maffliers, we followed the route. A beautiful hike that took us to the Novotel in Maffliers without any major problems. There was a bit of elevation gain, though.

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joelle C&R
joelle C&R

Overall rating : 4.7 / 5

Date of your route : Aug 03, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Superb hike on Sunday, 2 August 2020. We enjoyed the undergrowth given the ambient temperature and, of course, the lack of wet areas. Only the greener and denser vegetation made us apprehensive.
We missed "the very discreet path" at point 13 but easily caught up with the route a little further on.
However, at point 14, we did not see the manor house.

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Netra
Netra ★

Hello again,

It is possible that there may be exceptional hunts outside the usual season for certain species that tend to proliferate, such as wild boar.

So be careful...

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