Snow line

This alternate route via the Col du Four gives us a good opportunity to cross the snow line. On the way up to the Col du Four, you might have noticed that the vegetation is becoming increasingly patchy.
The first permanent snow line is around 2700m above ground, at the Col du Four, which marks the area where snow can be seen year-round. Although the vegetation is sparser, it still can be seen: mostly moss and lichen and also other plants such as androsaces, saxifragas and glacier buttercups (visible during the climb). The flora finds shelter from the wind and cold in the crevices of the rocks; some plants grow in the form of a cushion.