The lake of Alleghe in the valley of Cord?vole is today exactly 242 years old. The moment of the birth of the lake is well known, at 7:02 in the morning of January 11, 1771 the river flowing through the valley became dammed by a landslide coming from the mountain Piz.

Fig.1. General view of the valley of Cord?vole with the village and lake of Alleghe, on the left of the mountain Piz the scar of the landslide is barely visible in the forest, in the background the Civetta (3.220m).