A walk around Lac Vert
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A walk around Lac Vert
Passy

A walk around Lac Vert

Fauna
Very easy
1h30
3,8km
+136m
-136m
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A easy access to enter a Canadian atmosphere, an discover an emerald green lake nestled in the woodland.
"It is a small lake, which is called, I believe, Lac Vert -the Green Lake, because of the thick grass covering its banks and makes it look like a crystal mirror bordered with green velvet".
Victor HUGO

10 points of interest
Fauna

Golden Eagle cainism

In their nest perched against a rock wall, two chicks will soon emerge from their eggs. Only one will survive: the weakest one will be killed by the strongest! In biology, this behavior is called "cainism".
This phenomenon is common for diurnal raptors, since it is part of the species survival strategy: selecting straight away the strongest in order to increase its chances of reaching adulthood. For the parents, it's indeed a great job to feed a voracious juvenile which, from 100g at birth, must reach 5kg by the time it starts flying!
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La Maison de la Réserve

The exhibition an information office Maison de la Réserve naturelle de Passy is located in Plaine-Joux and welcomes you during the school holidays. The permanent exhibition about fauna, flora and landscapes will open the doors to the nature reserve. You may find answers to some of your questions here and can admire the wild species hidden in nature. If the Maison de la Réserve naturelle is closed, don’t worry, go up to the passageway. There is permanent free access to information about former (geological times) and present landscapes, the wonders of biodiversity and the great challenges of the mountains of the future (water, glaciers, global warming...).
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Fauna

The placid Ibex

The Ibex is not very shy, especially compared to the Chamois sharing its territory.
Unlike most other mountain species, it remains at altitude even when winter and snow arrive.
It then reaches ridges and snow-cleared areas where it will more easily find grass to feed on. This search for food costs a lot of energy. So, if you see it, do not approach and let it leave quietly in order to avoid wasting its precious energy, especially in winter.
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Geology

The mont Blanc

Beneath the snow and the glaciers, two main rock types form the Mont-Blanc Massif: the sharp edges and the highest peaks are made of very hard granite (from the left to the right: Aiguilles de Chamonix including Aiguille du Midi, Mont Blanc du Tacul, Mont Maudit, summit of mont Blanc) while the rounder - because softer - parts are in gneiss (from the left to the right: Dôme du Goûter, Aiguille du Goûter, Aiguille de Bionnassay,...).

These two so-called crystalline rocks come from the core of the Earth in fusion.
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The history of Plaine-Joux

From forest to mountain pasture, Plaine-Joux has not always been a ski resort as reflected in its name, which would mean "forest on a flat space".

As early as the 1930’s, the inhabitants of Passy were already practicing ski activities in this location enjoying a magnificent panorama. It was around 1965 that it officially became a communal ski resort. Even nowadays, Plaine-Joux remains, as well in summer as in winter, a popular family resort for skiing, hiking, paragliding... and contemplation.
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Fauna

The Common Minnow and the Common Chub

Minnows are very common in highly oxygenated waters. Its presence in high altitude lakes is due to trout fishing activities. Used as bait by fishermen, it colonized these mountain lakes.

The Chub is a rather large fish, very widespread in France. It is an omnivore, which means that it eats everything. In many European countries, especially in the east, it is of highly culinary interest.
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Fauna

The common Toad

Kissing a toad transforming it into a charming prince is a myth! You must not touch this protected species, which is sensitive to diseases that humans could transmit.
But you can look it in the eyes to observe its horizontal pupil and its orange iris. You will also notice its parotid glands on the back of its head. They are used to secrete a venom, the "bufotoxin" intended to keep away any possible predator.
The toads and frogs are not the same species; toads live mostly in the forest, out of the water, joining it only during the breeding season !
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Lake

Lac Vert

This amazingly colored lake was probably formed by the landslide of the Dérochoir rock (Fiz ridge to the north) in 1471.
There are several explanations for its emerald green color, including the surrounding vegetation consisting mostly of spruces, which are reflected in its waters. But the presence of blue algae or cyanophyceae in the lake is also a probable cause.
The water comes from sources providing the lake by its surface and underground.
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Fauna

The Grass Snake

Semi-aquatic, it mainly frequents wetlands but also drier environments hosting its main prey, such as amphibians (frogs, toads, salamanders or newts).
It's a protected species, like all reptiles!
It can be identified by its round pupils, its olive grey color and its double black and white or yellow collar shaped pattern. Or by another special feature: when it feels in danger, it spits out a foul smelling liquid and pretends to be dead, revealing its two-colored piano pattern on its ventral surface!
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Fauna

Odonates

Odonates, more commonly known as dragonflies, are insects.
There are two stages in their lifecycle: a "larva" (or nymph) stage which is aquatic followed by a terrestrial stage, when the adults are grown to adults.
Dragonflies are predators: they are carnivores that feed on different types of prey depending on their stage. They eat other insects as well.
Their distribution is strongly linked to climate conditions and any change has a strong impact on their presence. Destruction of their wetland habitats is one of the main threats to dragonflies.
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Description

  1. Go to the reception building of the station. Take the paved road, direction Lac Vert. Beacon 102.
  2. At 150 meters, at the basin on the right, go to the ski lifts.
  3. At the edge of the forest, take the track with the indication Lac Vert. Follow it until it crosses the paved road.
  4. Cross this road and take the track which starts in front of you, direction Châtelet d'Ayères. Continue you hike. Beacon 93.
  5. At the forest track, continue on the right, in the direction of Lac Vert / Plaine Joux. Beacon 94. At the parking lot of Lac Vert and the restaurant, at the wooden basin, take the small path that leads to the shore of Lac Vert.
  6. Possibility of walking along the bank on the left, for a view on Mont-Blanc reflecting on the lake waters. Beacon 159.
  7. For the return, from the parking lot of the lake, follow the direction of Plaine Joux by road. Beacon 92.
  8. After a bend, take the track on the left (the one you took to come). Continue on it. Beacon 93.
  9. At the sign, turn right towards Plaine Joux. When the track arrives at the paved road, turn left towards Plaine Joux.
Departure : Maison de la réserve naturelle, Plaine Joux station
Arrival : Maison de la réserve naturelle de Passy
Towns crossed : Passy

Altimetric profile


Recommandations

Always be careful and plan ahead when hiking. Asters, CEN 74 can not be held responsible for the occurrence of an accident or any inconvenience on this itinerary.

Transport

Bus SAT Mont-Blanc L85

Access and parking

Reach the Passy Plaine-Joux resort by road D43.
Parking located at the entrance of the station.

The station is also served by the bus line L85 (SAT Mont-Blanc).

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