The green spaces of Sucy-en-Brie from Boissy-St-Léger station

A surprisingly green walk, mostly passing through a succession of forests, numerous parks and other green corridors. It also takes you through the history of the centuries preceding our own, thanks to the architectural legacy they left behind, some of whose monuments have fortunately been well preserved, such as the Château de Sucy or the Château de Haute Maison, whilst others reveal only their outbuildings, such as the Château du Piple, or have left nothing but ruins, such as the Château du Grand Val. 

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 18.51 km
  • ◔
    Average duration: 5h 40 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 141 m
  • ↘
    Descent: - 141 m

  • ▲
    Highest point: 107 m
  • ▼
    Lowest point: 38 m

Photos

Description of the walk

(S/E) On leaving the station, cross Boulevard de la Gare, turn left, go round the bar-tobacconist-betting shop, and turn right onto Avenue du Général Leclerc. Cross it 50 m further on at the first set of traffic lights and climb the few steps to a small square opposite.
Head towards Avenue de Paris, turn right, then take the first left onto Rue de l’Église.

(1) Pass the church and a beautiful historic house on the left and continue straight ahead.
Cross over the motorway (N19), then immediately take the path on the left which leads into the forest. When you reach the Ferme du Piple (the château of the same name is not visible), turn right along the boundary wall. Cross at the pedestrian crossing just before the roundabout.

(2) Opposite, enter the Grosbois Regional Forest. Continue along the path opposite, passing under the high-voltage power lines. When you reach the Pelouse du Progrès, cross it to find a lovely avenue opposite. Turn left onto Allée Élisabeth. After about 800 m, at a junction marked by a fine oak tree on the left (bearing a sign for Allée Élisabeth), turn right onto Allée Wagram.
Cross a path and take the track opposite, which turns left after 200 m.
You will arrive at the Chêne des Bruyères, a remarkable tree, though apparently dead.

(3) Continue towards the car park, pass under the high-voltage power lines, and enter the housing estate opposite via the narrow lane through the gap in the boundary wall. Turn immediately right and enter the forest.
Take the first lane on the left (Allée Royale). At the second T-junction, take the second left onto a path that continues through a housing estate. Continue straight ahead along Rue de Brie, which leads to the Parc des Sports de Sucy.

(4) After passing through the gate, take the path on the right and go round the main facilities via the forest paths.
Following the fence, you’ll reach an artificial stream which you follow. Cross the first footbridge and walk alongside the lake on your right. After crossing a bridge, take a path on the right (fountain at the junction), leave the park and continue straight ahead along Allée du Parc.
At the roundabout, turn right onto a path and you’ll reach a second roundabout with traffic lights (pharmacy on the left).

(5) Cross over and enter the Parc de la Garennière straight ahead. Follow the main path; at the first fork, take the path on the right, then when you reach a housing estate, turn right, then left into a green corridor running alongside the Ruisseau de la Fontaine de Villiers, a stream that is very deep-cut in places. Continue to the end of this clearing, for about 1.5 km, until you reach a road.

(6) Follow it to the right, climbing steadily. After about 500 m, take a path on the left (at a speed bump, just after a junction). You will soon reach another path: take the left.
Cross a culvert, then turn left into a wide open gully in the forest, which more or less follows the Morbras.
You’ll reach a road via a small embankment. Cross over, then take the lane leading up towards the Amboile Gymnasium.
Cross the small car park and enter the Parc du Morbras.

(7) Walk down to the Morbras stream, then turn right onto the path that curves sharply along the right bank. When you reach a series of steps on the right, climb them to reach an area with a gazebo and picnic tables: ideal for a midday break whatever the weather.
Then head back down the slope along a small path to the edge of the stream. Follow it to the park exit.

(8) Turn left onto a path with a few flights of steps leading down to Rue Gambetta. Turn right and walk along the pond. Cross a bridge, then turn left into Rue Pasteur.
You will reach a sort of semi-circle, situated in line with the dual-lane avenue that led to the Château de Grand Val, of which only a single, rather unimpressive wing remains today, but where Denis Diderot is said to have lived during the final years of his life.

(9) Retrace your steps and take the first right, Rue de la Ferme.
Cross the large square courtyard, still flanked by the old buildings of the château’s farm, now occupied, amongst other things, by the cultural centre. Pass under the portico and turn right into the “Cité Verte”, a complex of large square-shaped blocks scattered throughout a vast wooded park. 
Follow a series of paths, which first pass to the right of the first block, then between the next two, until you reach a tarmac path.

(10) Cross this and, continuing more or less southwards along the paths, reach the rear of the Château de Sucy. Walk around it, admire the fountain of the four seasons, and exit through the porch. Take the avenue on the left, cross it at the pedestrian crossing and arrive at the Château de Haute Maison.

(11) Walk around the château, take the path on the left after the brick building, cross two small car parks and follow the path straight ahead into the wooded area (Parc Halévy).
Cross a road, then walk along the left-hand side of the cemetery wall to reach Fort de Sucy.

(12) A small part of the fort is open to the public; then retrace your steps. 
Just before the end of the park, take a path on the left before the first buildings, then turn right onto Rue Halévy. At the crossroads, take the street on the left and cross Parc Chaumoncel diagonally.
When you reach Avenue Churchill, turn left, then immediately right before the bus stop, onto the path that quickly becomes Rue Sainte-Amaranthe. Cross a road and open the gate opposite to reach the viewpoint on Rue du Gal Ruelle (private, but access is permitted).

(13) Return to the gate, take the street on the left to Saint-Martin Church.
Turn left into the passage (between the hairdresser’s on the left and the parish centre on the right), then head down to the right. Turn right onto Rue des Remparts, then left after 50 metres through a discreet passage under the building, signposted “Jardin des Senteurs”. Continue along a series of paths that zigzag to Rue de Boulards. 

(14) Cross it and continue opposite along the Sentier de la Garenne.
At the T-junction, take the path on the right. Cross two roads, then follow a track through the park opposite. You’ll reach Avenue du Piple; cross it and, a little further on, you’ll find a well-marked path.
200 m further on, at the crossroads of paths, take a path on the right.
About 300 m further on, you’ll arrive near the corner of the boundary wall of Château du Piple.

(15) Follow the main path, which winds its way, but without ever losing sight of the wall on your left, and
you will reach the D229. At the corner of the wall, you can see the pretty Maison Rouge above the gate.

(16) Continue along the D-road heading south.
Go round the roundabout, cross over the N19 and arrive at the station (S/E)

Waypoints

  1. S/E : km 0 - alt. 57 m - East exit, coach station - Gare de Boissy-Saint-Léger
  2. 1 : km 0.67 - alt. 90 m - Église Saint-Léger (Boissy-Saint-Léger)
  3. 2 : km 1.76 - alt. 97 m - Entrance to the Grosbois Regional Forest
  4. 3 : km 3.83 - alt. 98 m - Chêne des Bruyères
  5. 4 : km 5.71 - alt. 99 m - Sucy-en-Brie Sports Park
  6. 5 : km 7.65 - alt. 97 m - Roundabout
  7. 6 : km 9.39 - alt. 58 m - Rue du Général de Gaulle, near the - Morbras (rivière) - Affluent de la Seine
  8. 7 : km 10.66 - alt. 62 m - Entrance to the - Parc du Morbras
  9. 8 : km 11.94 - alt. 48 m - Exit from the - Parc du Morbras
  10. 9 : km 12.47 - alt. 43 m - Ruins of Grand Val Castle
  11. 10 : km 13.03 - alt. 69 m - Cité Verte: Allée Vlaminck
  12. 11 : km 13.58 - alt. 96 m - Château de Haute Maison
  13. 12 : km 14.24 - alt. 97 m - Fort de Sucy (Sucy-en-Brie)
  14. 13 : km 15.43 - alt. 92 m - Rue du Général Ruelle
  15. 14 : km 16.29 - alt. 70 m - Rue des Boulards / Sentier de la Garenne
  16. 15 : km 16.96 - alt. 60 m - Fence wall of the Château du Piple
  17. 16 : km 17.8 - alt. 48 m - Maison Rouge
  18. S/E : km 18.51 - alt. 57 m - Boissy-St-Léger station

Notes

Shops are never far away in this urban area.

Some of the more “unspoilt” sections can be muddy in wet weather: wear suitable footwear. 

Reviews and comments

4.3 / 5
Based on 5 reviews

Reliability of the description
4 / 5
Ease of following the route
4 / 5
Route interest
4.8 / 5
Claude L2.
Claude L2.

Thanks for the update. Let’s hope the work in Grosbois Forest doesn’t take too long.
Apparently I was lucky to get through the farm between 9 and 10... so I had to take a detour

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jaco948
jaco948
• Edited:

Overall rating : 5 / 5

Date of your route : Apr 25, 2026
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

I really enjoyed this walk, which is rated as moderately difficult: perhaps because of its length, but in reality the route is mostly flat and the paths are fairly easy. The only difficulty, for those with tired knees, lies in the number of fallen tree trunks lying across the paths that you have to step over!
Two minor issues to note: the section between points 2 and 3 in the Grosbois forest is impassable, as all the paths are closed for works. The only alternative is to follow the path straight ahead, running parallel to the houses and under the high-voltage power line, for about 1.5 km.
Further on, as already noted by others, it is not possible to cross the farm between 9 and 10; the yard is closed off on both sides. You must therefore go round it on the left, before rejoining Rue du Grand Val.
I have slightly adjusted the route through Morbras Park to pass as close as possible to the stream.

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poret
poret

Overall rating : 3 / 5

Date of your route : Apr 23, 2026
Reliability of the description : ★★☆☆☆ Disappointing
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

A walk through forests and parks
The description of this walk isn’t very precise; we had to go back and forth quite a bit to find the right paths

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Patolihen
Patolihen
• Edited:

Overall rating : 4.7 / 5

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

Hike completed on 15 August 2025 in fairly warm weather, and I'm glad to have finished it.
I left from Val d'Oise, an easy and relaxing 1 hour and 10 minute journey before tackling the hike.
It is best to follow the route with your phone, as the zigzags around the castles of Sucy en Brie are not always obvious.
It appears that the courtyard noted at point 9 is closed.
You can have lunch by the Morbras stream (with your feet in the water) or under the bandstand with a view of the large park.
Thanks to the author

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User 2095954

Overall rating : 5 / 5

Date of your route : Jun 16, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent hike, very varied through woodland and leafy lanes. We chose this hike to scout out the area for our club in anticipation of the hot weather at the end of June. Almost everything is in the shade.
However, parking in Boissy Saint Léger proved impossible, so we decided to start from point 3 (the Boissy Saint Léger forest house, which Waze knows, where there is a large car park).
Very easy to follow with the GPX track and description.
Be careful at the end of the route: there's no need to go back down to Boissy St Léger station. Instead, at point 16 (red house), turn left onto the large Pompadour alley (see yellow line on the attached map), which will take you back to point 2.
Thanks to the person who suggested this walk, we had a great time.
Oh dear, I realise you can't attach photos.

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MBERARD
MBERARD

Overall rating : 4 / 5

Date of your route : Jun 09, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A very interesting route, although it is in the Paris suburbs, taking us through forests, parks, green corridors and monuments.

However, given how difficult it is to follow the route, we recommend using the VISORANDO app and the GPX tracks.

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