Trail. Le grand ratz – Roche Brune Viewpoint loop from Voiron
Trail. Le grand ratz – Roche Brune Viewpoint loop from Voiron
4.0
(3)
209
runners
Trail. Le grand ratz – Roche Brune Viewpoint loop from Voiron
03:03
20.8km
990m
Running
Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required. The starting point of the route is accessible with public transport.
Last updated: September 24, 2026
Tips
Your route passes through a protected area
Please check local regulations for:
Waypoints
Start point
Bus stop
5.06 km
Viewpoint
Viewpoint
6.32 km
Trail. Le grand ratz
Highlight • Other
6.36 km
Forest in Parc Naturel Régional de Chartreuse
Highlight • Forest
Translated by Google •
Tip by
7.44 km
Hamlet of Farmhouses and Old Houses
Highlight • Settlement
Translated by Google •
Tip by
7.85 km
Espace naturel sensible du Grand Ratz
Nature Reserve
11.1 km
Roche Brune Viewpoint
Highlight • Viewpoint
Translated by Google •
Tip by
11.7 km
Pas du Col
Mountain Pass
20.8 km
End point
Bus stop
Way Types & Surfaces
Way Types
10.9 km
5.11 km
1.92 km
1.44 km
853 m
496 m
Surfaces
8.25 km
5.24 km
3.24 km
2.01 km
1.87 km
149 m
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Tuesday 13 October
22°C
9°C
0 %
Additional weather tips
Max wind speed: 14.0 km/h
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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
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