The Blue Lake (Italian: Lago Blu, French: Lac Bleu) is a mountain lake of the Pennine Alps, located not far from the Breuil-Cervinia ski resort in Valtournenche, Aosta Valley, Italy.

The lake is located at a height of 1,980 metres above sea level.

Its pristine waters are known for reflecting the Matterhorn.

[1] Media related to Lago Blu at Wikimedia Commons