Monumento naturale regionale del Sasso di Guidino, Natural monument in Besana in Brianza, Italy.
The Sasso di Guidino is a massive erratic boulder located within Villa Guidino park. The stone displays the characteristics of a glacial deposit, revealing how it arrived in this location from distant mountain regions.
The stone was transported here from the Valtellina region through glacial movement during the Würm glaciation period. This journey occurred thousands of years ago and demonstrates how far south the glaciers extended in ancient times.
Locals long called the boulder "la stella di Guidino", the star of Guidino, believing it had fallen from the sky. The belief traces back to the Insubri Celts settled in the area, who held the stone sacred and told that the goddess Mórrígan had hurled it from the heavens.
The boulder sits on the perimeter wall of the Villa Guidino park, in the Guidino locality of Valle Guidino, on the border with Villa Raverio in the municipality of Besana in Brianza. It is reached on foot from the surrounding streets; the stone itself stands outdoors and can be seen at any time of year.
This boulder is the southernmost erratic formation of its kind in Lombardy, marking the extreme limit of glacial reach in the region. Its position makes it a notable geological landmark in paleoclimate history.
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