"The track merges between the natural lakes of Lozières. These depressions were originally formed by the hollowing of glaciers or moraine deposits, such as the ""glacial lakes"" of Roche Ferrran and Pelve which are located upstream. But as they are older and lower in altitude than their neighbours, the “grassy lakes” of Lozières vegetate. Ÿou will therefore find aquatic vegetation, such as the bur-reed, a flowering plant which forms long filaments on the surface of the water. Ÿou can also see curious pompoms on an erect stem, the Eriophorum scheuchzeri. This plant species dœs not tolerate competition, it colonises only the lake shores on siliceous ground."