The upper Valdarno is vast natural basin closed in the north east part of the mount of Pratomagno anf enclosed in the delimitated in the south west by the modest Mounts of Chianti.

The Arno is entered by crossing the "The Inferno Valley", a long gorge that today is occupied by two small artificial basins together that empty into the "Incisan Straight".

The small valley of Valdorna is divided between the provinces of Arezzo and Florence. The Aretina part spreads out to include the furrowed territory of Ambra, with the great Tuscan river to its left.

The Valdarno gives way to a pluthera of landscape: alpines line the slopes of Pratomagno, the pictoresque phenomena of claylike erosion that "paint" the canyon walls that in part were left unearthed by man, all crossed over by the great byways of communication (Autostrada del Sole, Traintracks); typical of the southern Tuscan hillside towards the Valdambra and Senese.