The Piégu oppidum, the Guillandiére fountain and the Castrum Saint-Jean

A beautiful hike starting from Les Rougiers at the foot of Sainte Baume, where you will discover historical sites dating from the Gallo-Roman period to the Middle Ages: the Piégu oppidum, the Fontaine de la Guillandiére, the Château Saint-Jean, the ruins of the fortified village and its troglodyte dwellings, and its 19th-century chapel.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 13.32 km
  • ◔
    Average duration: 5h 15 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 491 m
  • ↘
    Descent: - 491 m

  • ▲
    Highest point: 675 m
  • ▼
    Lowest point: 393 m

Photos

Description of the walk

Reach Les Rougiers via the D1, drive up to the top of the village, taking Rue de la Rousse then Rue Sainte-Anne. Park near a water reservoir.

(S/E) Go up the street on the right until you reach a dog breeder's house on a bend.

(1) Take the path that climbs up to the right, marked in yellow and red. Continue for 800 metres.

(2) At a cairn, take the path that descends and then climbs again. Be very careful, as the path is difficult to see.

(3) When you reach the first intersection with a cairn, continue straight ahead. A faint red marker is partially visible. Do not take the path that branches off to the left, as it can be confusing (it is not shown on IGN maps but is clearly visible).

(4) At this point, a cairn marks a path that turns left at a 90° angle. Take this path, which climbs steeply through the woods to the summit of Piegu.

(5) From there, a large cairn (photo) marks a 360° panorama with a magnificent view. Continue a few metres to reach the Piegu oppidum.
Follow the path along the ridge, marked with green signs, and descend slowly.

(6) At an elevation of 564 metres, turn right and continue along the path until you reach a junction.

(7) Take the wide path, Les Plaines, on the left, heading south towards the rest area, marked with yellow and red signs. Shortly afterwards, leave a forest track on your left that leads to Cambon (marked by a sign).

(8) When you reach the D95, cross it and take the Capelette track opposite.
On this wide track, you will overlook the Vallon de la Capellette. Approach the ravine with caution to see some magnificent rocks. Continue along the main track without leaving it.

(9) At this point, turn left and continue straight ahead, descend sharply into the valley, cross the stream (dry if there has been no rain) and climb back up to an intersection. Leave the track that climbs back up to the small departmental road and continue for a few metres.

(10) Before a large bend, which also climbs back up towards the departmental road, take the path that descends steeply to the right (this path is not marked on the IGN map), a cairn serves as a landmark. Descend to the stream and follow it on the left bank until you reach a new intersection, marked with green signs.

(11) Take the path on the left, marked by a cairn, which climbs into the woods towards the Fontaine de la Guillandiére, consisting of three arches with a metal bench opposite. Be careful, this path is not very visible.
Pass the fountain on your right and take the path that climbs up to a track.

(12) Turn left and continue to an intersection, where you will find the junction of the loop that leads to the fountain.

(10) Go up to the departmental road and go down to the right along the road until you reach the intersection where Castrum de Saint-Jean is indicated on a tourist sign.

(13) Go up the track on the left that leads to the ruins of the 12th-century Château de Saint-Jean. On the right, enjoy a magnificent panoramic view.

(14) Continue along the path on the left that runs alongside the fortress to descend to the chapel. Further down is an orientation table, then the village and its cave dwellings.
After visiting the ruins of the village, go back up a little and take the path on the right, passing several oratories marked with green signs.
Follow this path downhill to return to your vehicle in the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 393 m - Water supply
  2. 1 : km 0.27 - alt. 425 m - Intersection, near a dog breeder
  3. 2 : km 0.81 - alt. 443 m - Path on the right
  4. 3 : km 1.02 - alt. 432 m - Follow the path straight ahead
  5. 4 : km 1.81 - alt. 499 m - At the intersection, take the path perpendicular to the road
  6. 5 : km 2.04 - alt. 604 m - The Oppidum of Piegu
  7. 6 : km 2.79 - alt. 564 m - Intersection, on the right
  8. 7 : km 3.56 - alt. 557 m - Intersection, on the left
  9. 8 : km 5.59 - alt. 675 m - Departmental road D 95
  10. 9 : km 7.74 - alt. 558 m - Intersection, on the left
  11. 10 : km 8.24 - alt. 540 m - Path on the left
  12. 11 : km 8.86 - alt. 493 m - Intersection, on the left
  13. 12 : km 9.21 - alt. 557 m - The Guillandiére fountain
  14. 13 : km 10.83 - alt. 510 m - At the intersection, head towards Castrum Saint Jean
  15. 14 : km 12.05 - alt. 584 m - Castrum Saint Jean
  16. S/E : km 13.32 - alt. 393 m - Water supply

Notes

The start of the hike to climb up to the Piegu oppidum requires some navigational skills. The "visorando" app with map positioning can be useful if you are unsure.
This hike is not very difficult technically.
It is very interesting for lovers of history and old stones.
There are no water sources.
Bring an IGN map, which I think is essential given the large number of trails on this route.
Good hiking boots and binoculars are also recommended.

Worth a visit

The three historical sites mark the periods from antiquity to the Middle Ages and up to the 19th century:
- (5) The Oppidum de Piegu: see the remains of the fortifications (photo) dating from the 2nd century BC. This site even hosted the famous general Marius Caïus, who came to inflict a severe defeat on the barbarians who had descended from Switzerland and Germany towards Rome. The Oppidum of Piégu belongs to a chain of oppida built around Sainte Baume.
- (11) The Guillandiére Fountain: In the past, the fountain was the water supply for the Château de Saint-Jean and the old village. From the Roman occupation to the Middle Ages, the villagers would come down to Guillandière with earthenware jars and vases to fetch water, which explains the abundance of pottery discovered during recent excavations.
- (14) The Castrum Saint Jean: History of the site at Castrum Saint-Jean de Rougiers, 12th century - Description via the link

Numerous websites recount the history of the places to visit during this hike.

Reviews and comments

4.1 / 5
Based on 47 reviews

Reliability of the description
4 / 5
Ease of following the route
3.9 / 5
Route interest
4.4 / 5
Fontenotte
Fontenotte

Overall rating : 3.7 / 5

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

The first part of the route is quite difficult, as the path is sometimes difficult to see. Then the section on the DFCI is long and less interesting. It's a shame, because Castrum Saint-Jean is very nice.

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francis henaut
francis henaut

Overall rating : 4.7 / 5

Date of your route : Oct 12, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

If you follow the description and the cairns in place, the route poses no problems. A GPS is a plus.
At point 10, after passing the spring, you can take the black path on the map, which avoids part of the tarmac road.

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alain83400
alain83400

Following on from the previous review, we couldn't find the path to the Guillandiere fountain between points 11 and 12. The path isn't visible from either side.
Similarly, on the climb from the start, the little-used path is difficult to see in places.
Otherwise, the castrum is magnificent and the view from the oppidum is very beautiful.

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alain83400
alain83400

Overall rating : 3.3 / 5

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

Even with the route on our smartphones, we couldn't find the path to the fountain at the

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Ceüze
Ceüze

Overall rating : 4.3 / 5

Date of your route : Sep 11, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

A very pleasant route thanks to its tranquillity and shaded, wind-sheltered paths.
A very peaceful hike near the village of Rougiers, far from the noise of civilisation.
A beautiful 360-degree panorama of the Alps and the Sainte Beaume Massif from the summit of Piégu.
Not far from the finish, the well-preserved ruins of Castrum Saint Jean and its chapel are well worth a visit.
A very beautiful circuit accessible to most regular walkers.

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robertcplm
robertcplm

Overall rating : 4.7 / 5

Date of your route : Jan 20, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

group hike completed on 20/01/25 using only the paper description, reading the road book the old-fashioned way, very reliable in terms of the distances given, except for the Guillandières fountain, which we missed (after the three arches, probably due to a mistake on our part).

very beautiful hike.
thanks to the author.

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nefertilou13
nefertilou13

Overall rating : 3.3 / 5

Date of your route : May 27, 2024
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

very disappointed by the route from point 2 to point 6; we had to scramble our way through the poorly marked path, which was overgrown, very steep and slippery in places
the highlight was the castrum and the chapel at the end of the hike

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Janine13
Janine13

Overall rating : 5 / 5

Date of your route : Apr 23, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very beautiful hike, but the first climb is quite steep. The route is easy to follow with GPS tracking. The castle and the view at the end are magnificent.

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Aktarus
Aktarus

Overall rating : 3.3 / 5

Date of your route : Nov 27, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

A very pleasant and colourful autumn hike with two beautiful viewpoints.
For most of the hike, the path is easy.

However, the GPS track for the hike is a bit tricky as it does not follow the IGN trail in some places.

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CARLE
CARLE
• Edited:

Overall rating : 3.7 / 5

Date of your route : Oct 23, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

Between markers 2 and 4, it's like Koh Lanta with no clear trail. We tried several routes before finding a trail that brought us back on the right path. The climb is not easy and slippery in the undergrowth
At point 12, the fountain is non-existent. Trust the IGN map, which shows a small blue dot. Small cairns on the right indicate the path. You still have to walk 500 m from the trail. The hike is rated moderate, rather difficult for the first few kilometres. Once you are on the trail, it is easier until you reach the castle. The return is via the orientation table. The descent is slippery

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Dod
Dod

Overall rating : 3.7 / 5

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

Between 2 and 4, the trail is rarely used, very narrow and very congested. From 4 to 5, it's unclear and if you lose the trail, it's difficult! 10 to 11 is great! The climb at 12 is actually 50 m further downhill. The descent after 14 could do with a little more detail to ensure you get back to the starting point, otherwise you end up on the right.
Overall, a superb hike!

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le dd
le dd

Hello,
I did this hike again a month ago, and the trail between points 11 and 12 is indeed a little off (I use the Visorando app), but it is clearly visible and well maintained for climbing up to the fountain.
Best regards
the dd

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83GENE
83GENE

Overall rating : 2.7 / 5

Date of your route : Mar 27, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★☆☆ Average
Very busy route : No

Nice hike, but the GPS track between points 11 and 12 is wrong.
There is no trail; we were in the brush and brambles

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pp34
pp34

Overall rating : 5 / 5

Date of your route : Feb 26, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful hike. The highlight is St Jean Castle.
There's also a beautiful view from the Piégu oppidum.
I recommend this hike.

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Pierrepfx
Pierrepfx

Overall rating : 3.3 / 5

Date of your route : Sep 16, 2022
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

A beautiful hike, but the route is sometimes quite unpredictable. The climb to the oppidum is quite difficult and it is better to take the IGN map trail from point 4 to point 5, as the suggested route does not seem very reliable. Do not follow the suggested route to climb up to the fountain either, as it is incorrect. Follow the IGN map instead. The fountain is beautiful, however. The descent to Rougiers from the superb Castrum is cool and pleasant.

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