The Arno is the main river flowing through Florence, Italy. It runs through the historic centre beneath landmarks including the Ponte Vecchio before continuing west through Tuscany.
The river rises on Monte Falterona in the Apennines and travels about 241 kilometres through the region. After passing Florence, it flows through Empoli and Pisa before reaching the sea near Marina di Pisa. Its drainage basin covers more than 8,200 square kilometres.
The Arno has shaped Florence’s commerce, bridges and famous skyline, but it has also brought destructive floods. The catastrophic flood of 4 November 1966 killed at least 41 people and damaged or destroyed artworks, books and buildings. The Arno is sometimes confused with the Tiber, Italy’s best-known river, but the Tiber flows through Rome; the Po runs through northern Italy.