The streams of the Valley

The rivulets, that from the verdant hills
⁠Of Cassentin descend down into Arno,
⁠Making their channels to be cold and moist,

Inferno, canto XXX (64-66)

Dante, like many other great authors and thinkers, was incredulous to see the richness of a territory like the Casentino, the green hills and streams creating an idyllic landscape.