Arno is a river in central Italy, flowing through the region of Tuscany. It is approximately 241 kilometers long and is known for its scenic beauty and historical significance. The river passes through several cities, including Florence and Pisa, and has been an important waterway since ancient times. The Arno river is also famous for its picturesque bridges, such as the Ponte Vecchio in Florence. It plays a crucial role in the local ecosystem and supports various recreational activities, including fishing and boating. The river's basin is rich in biodiversity and contributes to the region's agriculture.