Mont Gros (Monte Grosso) fortifications

Mont Gros (Monte Grosso) is a small peak above the Col de Brouis. It occupies a strategic position on the line separating the Bévéra and Roya valleys. The Monte Grosso fortification was built between 1931 and 1935 and forms part of the Maginot Line, the fortified sector of the Alpes-Maritimes. Beyond its historical significance, this route offers magnificent panoramic views of the Mercantour peaks and the ridges bordering Italy.

Details

9778428
Creation:
Last update:
Last review:
  • Walking
    Activity: Walking
  • ↔
    Distance: 7.20 km
  • ◔
    Average duration: 3h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 435 m
  • ↘
    Descent: - 443 m

  • ▲
    Highest point: 1,262 m
  • ▼
    Lowest point: 819 m

Photos

Description of the walk

The start of this hike is at Col de Brouis. (D2204 linking Breil-sur-Roya to Sospel)

Yellow markings throughout the route.

(S/E) From the small car park at Col de Brouis, join the track known as the “Route de l’Armée des Alpes”

(1) Follow this stony track for about a kilometre, passing an old barracks converted into a farm, until you reach marker 125.

(2) Continue along the Route de l'Armée des Alpes until the first bend. Leave it on your right, take the Baisse de Levens path and arrive at a stream.

(3) Although this stream is dry, the floods caused by Storm Alex have destroyed the crossing.
You will need to descend a few metres to find a temporary crossing. Return to the path via this makeshift crossing. Head back to the Baisse de Levens by following this well-marked path.

(4) Heading south-southeast, continue to a fork. Take the left-hand path (signpost with a yellow arrow). Follow this pleasant, almost flat path through the woods until you reach another junction.

(5) Ignore the path on the left, which is for the descent only. Continue eastwards and start a circular route to come out facing the ridge leading to the summit.

(6) Leave the path on the left and follow the ridge until you reach the first combat block. Explore the various blocks with their imposing surfaces, topped with gun turrets. At the last block, reach the summit of Mont Gros.

(7) From Mont Gros, return to the junction with the path designated for the descent.

(5) Turn right onto the descending path. At Marker 138, turn 90° and, after about a hundred metres, begin the winding descent to Marker 137.

(8) Turn right, head back to marker 136 and the Col de Brouis road. Take the D2204 and drive carefully back up to the Col de Brouis car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 880 m - Small car park at the - Col de Brouis
  2. 1 : km 0.05 - alt. 877 m - Chemin de l'Armée des Alpes (signposted Mont Gros)
  3. 2 : km 0.99 - alt. 903 m - Waypoint 125
  4. 3 : km 1.1 - alt. 915 m - Stream (dry)
  5. 4 : km 2.31 - alt. 1,090 m - Waypoint 139 - Baisse de Levens
  6. 5 : km 2.95 - alt. 1,140 m - Junction
  7. 6 : km 3.16 - alt. 1,172 m - Ridge path on the right
  8. 7 : km 3.77 - alt. 1,262 m - Mont Gros
  9. 8 : km 5.9 - alt. 875 m - Marker 137, turn right
  10. S/E : km 7.2 - alt. 879 m - Col de Brouis (Small car park)

Notes

For those wishing to avoid the 900-metre stretch on the D2204 at the end of the route, head back down via the outward route from Monte Grosso. In this case, the route is approximately 9 km.

From point (4) to point (5), use the OpenStreetMap Hiking (World) map. This section is incorrect on the IGN map (it is shown 50 metres lower down)

On the return journey, from point (5) to point (8), use the IGN map; this section does not appear on the OpenStreetMap Hiking (World) map

This route passes through a protected area, which may be subject to special regulations:

Worth a visit

Reviews and comments

5 / 5
Based on 4 reviews

Reliability of the description
5 / 5
Ease of following the route
5 / 5
Route interest
5 / 5
velaguilar
velaguilar

Overall rating : 5 / 5

Date of your route : Mar 24, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Lovely walks.

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Jiaime
Jiaime

Overall rating : 5 / 5

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

A very well-described hike, done in January.
In summer, it must be well shaded for most of the way.
The access to the bunker is a bit steep.

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Dominique Torre
Dominique Torre

I can confirm the message from August 2021 that the makeshift path described in point (3) has since been upgraded with a stone staircase and that, as of 9 December 2024, it is still in good condition. Of course, during or immediately after a storm, you will need to wade through water for about two metres. This walk is still very pleasant.

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Pedro49
Pedro49

Overall rating : 5 / 5

Date of your route : Jun 12, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

We didn't complete the climb because the summit was shrouded in cloud.
Good yellow markings.

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bebeghislaine
bebeghislaine

Overall rating : 5 / 5

Date of your route : Apr 14, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A lovely walk with a superb view from the eastern summit of Mont Gros (1,266 m) overlooking Sospel; the fortifications are impressive. At marker 137, we turned left up a slope to rejoin the route we had taken on the way out; the total elevation gain was 500 m.

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henrigole
henrigole
• Edited:

The makeshift crossing described at (3) has since been refurbished with a stone staircase

Réaménagement passage torrent
Redesign of the stream crossing

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