The Fadalto saddle is a pre-Alpine pass that connects Val Lapisina to Alpago, between the provinces of Treviso and Belluno. The pass is narrow between Mount Faverghera on one side and the slopes that border the Cansiglio on the other.
The saddle was formed by multiple landslide events that affected its eastern side. The accumulation of material in the valley floor led to the formation of a barrier that interrupted the course of the Piave and formed two barrier basins, Lake Santa Croce on the Belluno side and Lake Morto in the Treviso area. Studies carried out on organic material found in the area have allowed us to place the first events at the end of the last ice age, when with the retreat of the great Piave glacier the counterthrust that supported the rocky walls disappeared. The landslide is still active: on the eastern flank there is still a large detachment niche, approximately 5 km long and 400 m high, subject to periodic collapses. The last one, still clearly visible, dates back to 2017.
Until 1995, the year the A27 motorway was built, the Alemagna state road 51 which passes right here was the only connection between the Treviso foothills and Valbelluna.