Route details
Route description
Discover a magical and wild place by taking a challenging route. In the heart of the Passy Nature Reserve, Lake Pormenaz offers an ideal setting for an unforgettable summer hike.
From Passy Plaine-Joux, take the track which leads to Barmus then to Ayères des Pierrières, where you will head towards Chalets du Souay.
After a short descent to the torrent, go back up through the Chorde (passage with ladders) to the splendid Lac de Pormenaz, an ideal place to take a break.
Then return to the Chalets du Souay via Les Argentières (some tricky passages).
Continue your descent towards the Châtelet d'Ayères refuge (accommodation, catering) and the balconies of Lac Vert to reach the starting point at Passy Plaine-Joux.
Mountain lakes are fragile ecosystems. It's best not to swim in them. The addition of organic or chemical matter (sunscreen, buoys, etc.) profoundly alters their functioning.
The Passy nature reserve is a protected and regulated area. Dogs, even on a leash, are prohibited, as well as motor vehicle traffic, fires and overflight, including drones. The bivouac is tolerated from 19 p.m. to 9 a.m.
After a short descent to the torrent, go back up through the Chorde (passage with ladders) to the splendid Lac de Pormenaz, an ideal place to take a break.
Then return to the Chalets du Souay via Les Argentières (some tricky passages).
Continue your descent towards the Châtelet d'Ayères refuge (accommodation, catering) and the balconies of Lac Vert to reach the starting point at Passy Plaine-Joux.
Mountain lakes are fragile ecosystems. It's best not to swim in them. The addition of organic or chemical matter (sunscreen, buoys, etc.) profoundly alters their functioning.
The Passy nature reserve is a protected and regulated area. Dogs, even on a leash, are prohibited, as well as motor vehicle traffic, fires and overflight, including drones. The bivouac is tolerated from 19 p.m. to 9 a.m.
Topo / step by step
1) Plaine-Joux – 2) Barmus – 3) Les Ayères des Pierrières – 4) Chalets du Souay – 5) La Chorde – 6) Pormenaz Lake – 7) Argentières – 8) Chalets du Souay – 9) Ayères du Milieu – 10) Châtelet d'Ayères Refuge – 11) Lac Vert – 12) Passy Plaine-Joux
Good to know
Alert
Cable passages and ladders
Home of animals
Animals prohibited in the Passy nature reserve.