Once in Santo Stefano d’Aveto, the most touristic village in the park, we drive up to Rocca d’Aveto where we leave the car. We take the chairlift that takes us to a vast grassy basin with an elongated shape and turning left we go downhill, quickly reaching Prato della Cipolla. It is located on the west side of Monte Bue and surmounted by a spectacular sharp spike called Dente della Cipolla on which a precarious via ferrata climbs up, suitable only for expert mountaineers. The plateau is linked to the corrosive phenomenon of an ancient glacier that has furrowed these slopes for centuries. In fact, in the center you can see a marshy area which evidently represents a peat bog. Several centuries ago there was a lake of glacial origin which over time has withdrawn and is no longer visible today.