The Passy Mont Blanc nature reserve sums up the history of the mountains of Haute-Savoie. Come and discover a preserved fauna and flora in sumptuous landscapes with a view of Mont Blanc.
Town : Passy
Surface area : 1 800 ha
Altitude: from 1 347 m to 2 901 m
Creation : 1980
The nature reserves of Haute-Savoie are protected and regulated natural areas.
Dogs are forbidden, even if kept on a lead.
Motor vehicle traffic is prohibited.
Gathering, camping and fires are prohibited.
At the entrance to each nature reserve there is a specific signpost reminding you of the regulations.
If you have any questions, do not hesitate to contact the ASTERS manager.
The young cliffs of the Fiz dominate the sheep of the old Pormenaz, the formidable thrust of the Alps contrasting their limestone and siliceous natures. This mineralogical contrast gives rise to a variety of environments (grasslands, moors, wetlands) and alpine species (eagles, ibex, etc.).
From the forest to the alpine meadows, the fauna is very varied: grouse, chamois, ibex, marmot, rock ptarmigan, black grouse…
Many birds nest in the cavities of the cliffs: bearded vulture, golden eagle…
Herds of cows and sheep maintain the high altitude pastures.
The contrast between dry and humid environments creates an exceptional wealth of flora.
A total of 530 species have been listed, including the Saint-Bruno lily, which prefers the pastures, and the silene acaule, which colonises the rocky areas…
Flies and biodiversity
Hoverflies – a type of fly – are valuable indicators for scientists. By comparing the number and type of species of hoverflies before and after the clearing operations at Pormenaz, it is possible to assess the state of biological diversity.