At the borders of the plateau, there is a rich flora, but the main part ot this area is the inside which is a beautiful high-altitude marshe. It is a poor environment, saturated of water and acid. That is why we can find a specific flora and fauna. This is a real nature conservation area as itw as during the ice age.
The biological degradation for a marshe is slow. It constitute, thank to pollen conservation, a rich heritage made by history and climate.
60 species are identified, for 40 in the Arselle plateau marshe. The most importants are: sphagnum, cottongrass and butterwort. We found 2 protected species refering to the national plan: droseras and small carnivorous plants (insects eating plants).
At the beginning, the Robert lakes were one icy lake which form a bowl. Then, this unique lake was splits in two then three, which were dry, during the 50s. This lakes are feeded by snow water and for two small sources called les Trois Fontaines.
The « Robert » name might come from the « sheeps » which are drinking the lake’s water. Even now, you can meet the sheperd and its herd during summer, around the Robert lakes.
Today, there are 4 lakes. The two biggest are separated only when water is missing. The maximal depth for the 2 biggest lakes are 24 meters and 8 meters (Grand Sorbier side) whereas the rest is not deep at all. The water levels can moove, from months to months, thanks to rain.
At 1998 meters high, they measure until 28 hectares. Thanks to this altitude, they are frozen during winter. Three peaks circle the Robert lakes: Petit Van, Grand Van and Grand Sorbier.
This area is protected because of the rare and diverse flora and fauna. The site is part of the Natura 2000 above its 2677 ha. You can fish lake trouts there.
This lake is fabulous, probably th only one in France. It is circle by trees, more and more sparsed thanks to the altitude (until more or less 2200m). This lake is well oriented and well located, facing the Infernet mountain pass.
The bogs are located around the principal lake, in the form of small lakes (the real name is « Achard Lakes »), but which biologic activity is very particular.
When it is shinny, you will have a view on the Taillefer pic.
Its the most original natural area in the city, made from different cembros (or arolles) pines. In september 2015, a decree has been signed and classify the « Belledonne mountain cembraie, grass areas, lacs and bogs, from Chamrousse to the Grand Colon » as a Natura 2000 site, espsacialy to preserve it.
According to a survey made by the the Forest National Office (ONF) in 2012, it is well conserved and cover around 100 hectares.
A lots of vegetal species have their heritage valor and have been inventory in the serroundings.
It is near the Pourettes lake where you can look at the magnificent cembraie.