• Starting point : Saint-Mamet
  • Total distance : 7,6 km
  • Elevation : 586 m
  • Walking : 4 h. Medium
  • Trail : 2 h. Medium

A true natural curiosity nestled above the Gouffre d'Enfer (Hell's Chasm).
At the bottom of the Lis Valley, you can see the Portillon hydroelectric power station on your left, built in 1941.
Did you know that the water used in this plant comes from Lake Portillon, at an altitude of over 2,500 metres in the neighbouring valley? An 8-kilometre underground tunnel and a penstock (above the plant) (...)

Access the details of this itinerary on Cirkwi.com

Last update : 21/10/2025 à 05:15:23

Source : Cirkwi | Haute-Garonne Tourisme
Photo credit : AJ / Pyrénées31

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