Lac du Lou, Lake in Les Belleville, France

Lac du Lou is a small mountain lake in the Les Belleville area of France, surrounded by hills and rocky outcrops. The water is cold and tends to appear dark due to the rocks below the surface.

Lac du Lou was formed by a rockfall that dammed the valley, creating the lake at 2,005 m. The Torrent du Lou flows through it, and a mountain refuge was later built near its outflow at 2,045 m. The lake now lies within Les Belleville and is reached from the Pointe de la Masse cable car.

The lake lies on the summer walking routes from Les Menuires and Val Thorens and on multi-day high-mountain treks. At its outflow stands the Refuge du Lac du Lou, a mountain hut at 2,045 m where walkers can stop. In winter the same paths are used with snowshoes or touring skis.

The lake is reached on foot via nearby hiking trails and is manageable for most walkers. Summer is the easiest time to visit, while winter can bring snow and ice that make the route more demanding.

The lake was formed by a rockfall, and its outflow feeds the Torrent du Lou, a tributary of the Doron de Belleville. The Refuge du Lac du Lou stands at 2,045 m near the outlet, and the lake lies at 2,005 m, covering 7.6 hectares.