Arno river
The Arno is a river in region of Tuscany, Italy, that crosses all the region from Mount Falterona (near the city of Arezzo, in Casentino area), to Pisa where it enters Tyrrhenian Sea. It is the biggest river in the region.
It crosses Florence too, where it passes below the Ponte Vecchio. The river flooded the city in 1966.