Almost parallel to the famous branch of Lake Como, bounded by the majestic Grigne to the west and east from Bergamo Prealps, it opens the green Valsassina.
Valsassina is dotted with bright colors of the flowers and the dark patches of trees.
Everything is dominated by high mountains, among which:
The peaks of the Grigne group, the peak of the Campelli Noodler and Pizzo dei Tre Signori.
Valsassina is rich in pastures, woods of chestnut and beech trees. Is a home to many craft, industrial and tertiary and is crossed by Pioverna the sources of which are located just above the Col Balisio.
The Pioverna River runs through the valley collecting the incoming water Cremeno - Troggia - Bobbia - Acquaduro - Freggerola, forming a rich and sometimes picturesque water network and then channeled into the deep fractures of the rocks and create special effects such as can be seen in the famous Orrido di Bellano or the waterfall formed by Troggia at Introbio.