The tunnels and hills of Sernhac

Sernhac is located on the route of the Roman aqueduct, between the Pont du Gard and Nîmes.
In the middle of the nearby heath, two tunnels dug into the limestone rock are the remains of this aqueduct.
Continuing the walk, you will visit an old windmill. You will then climb Ferraud Hill, offering beautiful views of the lower Rhône Valley, the Alpilles, and more. Then, on Marduel Hill, overlooking Remoulin and the Gardon River at its end, the view extends all the way to Ventoux.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 9.81 km
  • ◔
    Average duration: 3h 40 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 292 m
  • ↘
    Descent: - 293 m

  • ▲
    Highest point: 167 m
  • ▼
    Lowest point: 37 m
  • ⚐ Country: France
  • ⚐ District: Sernhac (30210)
  • ⚑
    Start/End: N 43.917119° / E 4.552193°
  • ❏
    IGN map(s): Ref. 2941OT, 2942OT
  • Hour-by-hour weather

Photos

Description of the walk

After passing through the village and taking Chemin de l'Aqueduc to its end, park in the large clearing on the left.

(DA) Go to the back of the car park. On the left, cross the small canal (often dry) to reach the entrance to the Cantarelles tunnel. Go through the tunnel. Continue along the path until you reach a crossroads.

(1) Turn right. Ignore the paths that branch off to the right. You will come to a wider path; take it to the left. After a few metres, turn right, then right again at the intersection.

(2) Turn left and continue south to reach a large path.

(3) Take it to the right. Continue along the path, which runs alongside a high-voltage power line. Turn right, ignoring the other paths that branch off. Follow this path for about 700 metres to the north-west. You will come to a wide, stony fork in the road.

(4) Leave the main road and turn right onto a path that climbs up to the mill. When you leave the mill, follow the path under the holm oaks. Ignore the paths branching off to the right and left. Walk alongside an olive grove until you reach the first houses of Saint-Bonnet-du-Gard.

(5) Turn right onto Chemin des Heath Basses. Follow the yellow markings southwards. Turn left to reach Chemin des Cigales. Turn left again, then right onto Chemin de la Pataute. After the left turn, leave the wide path and follow a trail on the right to reach a signpost.

(6) Go up to the left on the path, which climbs steeply. On the flat section, leave the marked path and turn left onto a faint path that winds along the edge of the scrubland. It then opens up to follow the ridge line with a few rocky sections. Go to the top of the hill and begin a rocky descent which, at the bottom, leads to a path that you should take to the left.

(7) Cross the tarmac road and climb up a stony path on the left. It leads to a track suitable for vehicles. Turn right, pass the concrete section and, in the bend before the reservoir, climb the steep slope. Turn right under the holm oaks and follow the ledge, without ever going downhill, to the northern end.

(8) Retrace your steps for about 50 metres and begin the descent to the left, south-east, on a faint trail. At the bottom, you will arrive near the railway line. The path runs roughly parallel to it. You will come to a fenced-in property with horses. Follow the fence. You will arrive at the pumping station

(7) Take the same path as on the way up. Go past the end of the path you came down and continue straight ahead for about 800 metres. Cross the olive groves.

(9) Go to the entrance of the Perrotte tunnel. Cross it (taller people should watch their heads). At the exit, follow the path that goes around the quarry to return to the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 60 m - Parking in the clearing
  2. 1 : km 0.27 - alt. 67 m - Exit from the tunnel
  3. 2 : km 1.03 - alt. 128 m - Crossroads
  4. 3 : km 1.68 - alt. 118 m - Sernhac path junction
  5. 4 : km 2.93 - alt. 80 m - Fork in the road to the right
  6. 5 : km 3.64 - alt. 88 m - Suburb of Saint-Bonnet-du-Gard
  7. 6 : km 4.43 - alt. 113 m - Signposted fork in the road
  8. 7 : km 5.85 - alt. 45 m - Pumping station
  9. 8 : km 7.31 - alt. 80 m - Northern end of the ridge - Le Gardon
  10. 9 : km 9.53 - alt. 71 m - Getting to the entrance of the Perrotte tunnel
  11. S/E : km 9.81 - alt. 60 m - Parking in the clearing

Notes

Torch recommended for walking through tunnels (mind your head).
Stony paths requiring good footwear.
Avoid the summer months or periods of strong Mistral winds.

Moderator's note: GPS or GPS app recommended.

Worth a visit

Roman quarries and tunnels.
Windmill.

Reviews and comments

3.9 / 5
Based on 35 reviews

Reliability of the description
3.7 / 5
Ease of following the route
3.5 / 5
Route interest
4.4 / 5
Zinna
Zinna

Overall rating : 4 / 5

Date of your route : Nov 09, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : Yes

Very pretty hike with magnificent views. The tunnels are really nice, but it's a bit difficult to follow the trail, especially at the start and finish.
The ascents and descents are steep, so not suitable for people who never go hiking.

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jevimavi34
jevimavi34

Overall rating : 3 / 5

Date of your route : Mar 02, 2025
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★☆☆ Average
Very busy route : Yes

The description is sometimes unclear and the paths are difficult to find, particularly between points 5 and 6 where the trail does not always exist.

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Jean-Bernard
Jean-Bernard

Overall rating : 3.7 / 5

Date of your route : Feb 18, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

Hike done today, unfortunately in grey weather, as it is very pleasant to do for the views from the ridge line. The descent to point 7 is steep and rocky. Do not do this hike in wet weather as the ridge line between 6 and 7 is rocky, steep and, in this case, very slippery. The contour of the hill from point 7 is not very interesting. The car park recently indicated is the Vallon car park, but it is far from the starting point, which should therefore be reviewed. Furthermore, this car park is at the end of a dirt track lost in the countryside, so do not leave anything in your cars.

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Clopsinette
Clopsinette

Overall rating : 4 / 5

Date of your route : Nov 17, 2024
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful hike under the bright November sun. You'll need a GPS to stay on track! The descent before point 7 is a bit challenging: if you have weak knees, avoid it...
We stopped at point 7, so no opinion on what comes next. The tunnels are magnificent and you need to allow time to visit the entire site, including the restoration and panelling work carried out by the association that manages the valley.
The whole group was happy and surprised to discover these unknown tunnels, even though we have lived in the region for many years.

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3852318198
3852318198

Overall rating : 4.3 / 5

Date of your route : Jun 11, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

GOOD CIRCUIT BUT CONFUSING FOR THE TUNNELS

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Claude 2 Nîmes
Claude 2 Nîmes

Overall rating : 5 / 5

Date of your route : Apr 15, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very beautiful hike, easy and without any paved roads.
a pleasant walk with your dog and enjoyable scenery.

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bougerie
bougerie

Overall rating : 3.7 / 5

Date of your route : Jul 06, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : No

Nice walk, only interesting at the end of the route

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leodis
leodis
• Edited:

Overall rating : 3.3 / 5

Date of your route : May 01, 2023
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful and enjoyable hike with stunning views and pretty flowers in the heath. The route is quite difficult to follow with many crossroads; you'll need to use your GPS almost constantly to avoid getting lost! Even with GPS, we had a lot of trouble at point 4 finding the right path "up to the mill" (the path you need to take goes downhill first before going uphill later...)

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ericcameleon26500
ericcameleon26500

Overall rating : 4.3 / 5

Date of your route : Apr 07, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Beautiful hike with stunning views, no particular difficulty in following the GPS track, the best part is the tunnels

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moureton
moureton

Overall rating : 3.7 / 5

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

Hello,
A beautiful hike, but spoiled by the fact that the GPS track gets lost in the undergrowth at point 8.
Unable to continue, we returned to point 7.
Quite a technical hike between points 6 and 7, not recommended with children.

Les Godillots Ailés de Caissargues

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Patouille84
Patouille84

Overall rating : 4 / 5

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

The car park has moved, so go to the car park in Vallon Chemin des Cantarelles.
A beautiful hike... with GPS... otherwise you'll end up going round in circles!
After the 8, there was no marked path, just animal trails, so we gave up and retraced our steps.

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courbessac
courbessac

Overall rating : 4 / 5

Date of your route : Nov 07, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : Not used / Not applicable
Route interest : ★★★★☆ Good
Very busy route : No

we couldn't access the car park as the road was reserved for residents. The route is very poorly signposted; you have to follow the Visorando GPS.
Magnificent views, dangerous descent on rocky ground.

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Randorphine
Randorphine

Overall rating : 4.3 / 5

Date of your route : Oct 23, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A very pleasant hike on 23 October 2022, temperature 25°C, overcast but very pleasant for walking. Magnificent scenery, as indeed is the whole region
we completed it in about 4 hours with a few stops. It's best to have a GPS because there are too many different markings and trail junctions.
For our part, we went round in circles a bit compared to the explanations at the start, but we soon saw the end of the tunnel(s)!!
Otherwise, we highly recommend it for couples or families.
Walking shoes are essential.

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CABRU30
CABRU30

Overall rating : 4.3 / 5

Date of your route : May 01, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very interesting trail for the views and the crossing of the heath, with lots of flowering rockroses. It's true that you have to follow your GPS carefully to make sure you're on the right trail, as there are many starting points and crossroads.
Unfortunately, it was impossible to reach point 8 as the trail was overgrown, so we turned back at point 7 and headed back.
So be careful if you're following this route, bear this inconvenience in mind.
other than that, it was excellent! We ended up at the village bar, where we needed to rehydrate! A warm welcome

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Claire-Anne
Claire-Anne

Overall rating : 3.7 / 5

Date of your route : Feb 20, 2022
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : No

we had a lot of difficulty finding the trail, which was barely marked, in the second part of the circuit on Marduel hill.
Apart from that, it was an interesting circuit with beautiful views and lovely scenery.

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