
Set into the Grand Fond valley under the Col des Fours are some real gems: the Lac des Fours (not named by the IGN [French National Geographic Institute]) is a glacial lake which culminates at 2,899 metres. It is the result of the erosion created by the Fond glacier which retreated to leave a frontal moraine acting as a natural barrier and thereby creating this pretty lake often covered in snow and ice at the beginning of summer.