The ARNO is a river in Italy that runs through the cities of Florence and Pisa. The Reno is a river in northern Italy that flows into the Adriatic Sea. The ADIGE is a river in northern Italy that flows from the Alps to the Adriatic Sea. The Rubicon is a river in northern Italy that was famously crossed by Julius Caesar in 49 BC. The Tiber is a river in central Italy that flows through Rome. The Po is a river in northern Italy that is the longest river in the country. The Piave is a river in northeastern Italy that flows into the Adriatic Sea.