Circuit du Trou de l'Enfer
Key facts
- Distance
- 6.4 km
- Ascent
- +64 m
- Descent
- −68 m
- Estimated time
- 1 hr 35
- hiking
- Difficulty
- Easy
- official rating
- Route
- Loop
- back to the start
Official time: 1 h 30 min
Profile and gradient
- under 10%
- 10 to 20%
- over 20%
Gradient along the route: 6.4 km under 10%. Elevation from 1 m to 41 m over 6.4 km.
Surface and path types
- Surface
- Paved 68%
- Dirt & gravel 20%
- Unknown 12%
- Path types
- Trail 34%
- Track 7%
- Road 48%
- Off-network 11%
Difficulty
Official rating: easy, by Département de Loire-Atlantique.
Getting there
Start: La Bernerie-en-Retz, La Bernerie-en-Retz (44).
Sources
- Track: Département de Loire-Atlantique, PDIPR, Licence Ouverte 2.0, Licence Ouverte 2.0 (Etalab) (data.loire-atlantique.fr/explore/dataset/224400028_itineraires-de-promenade-et-de-randonnee-en-loire-atlantique-pdipr/). Time estimated by GPX Path with the Mac app rule, breaks not included.
- Official time: 1 h 30 min, data.loire-atlantique.fr
- Surface and path types: © OpenStreetMap contributors, ODbL, extract of 28 October 2026, matched to the track every 10 m (openstreetmap.org/copyright)
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