
They are numerous in Vésubie (twenty or so) and these lakes were formed around 10000 years ago. They occupy depressions created by the glaciers or the front of the moraine barriers they left behind as they shrank. Despite the fact that they are covered in ice for many months, they are home to invertebrate populations, molluscs, crustaceans, insects. The presence of fish (mainly trout) is due to human intervention, with the fish having been introduced for sport.