Lac de Saint-André, Protected lake in Porte-de-Savoie, France.

Lac de Saint-André is a lake in Porte-de-Savoie situated at the base of Mont Granier and ringed by walking trails and wooden piers. The water extends to a considerable depth, and the shoreline is divided into different zones that serve various purposes.

Lac de Saint-André lies at the foot of Mont Granier, in the Savoie department near Chambéry. It formed after part of the mountain collapsed in a landslide during the night of 24 to 25 November 1248, damming the depression that then filled with water.

The lake takes its name from Saint-André, the village that became part of Les Marches and now Porte-de-Savoie. Its origin is tied to the Mont Granier landslide of 24–25 November 1248, when part of the mountain collapsed and dammed the water. Visitors today see the flat water below the mountain's grey rock face, with reeds along the far bank.

Lac de Saint-André lies at the foot of Mont Granier in the commune of Porte-de-Savoie, near Chambéry in Savoie. The lake is reached from the village of Les Marches, and the surrounding slopes and shoreline are best explored on foot.

The lake owes its existence to the night of 24–25 November 1248, when part of Mont Granier collapsed and blocked the valley, and water filled the hollow behind the debris. The lake lies at the foot of that same mountain, in Les Marches near Chambéry, Savoie.