Pisa is a city in Tuscany, central Italy, on the right bank of the mouth of the Arno River on the Ligurian Sea. It is the capital city of the Province of Pisa. Although Pisa is known worldwide for its Leaning Tower (the bell tower of the city's cathedral), the city of over 87,500 residents contains more than 20 other historic churches, several palaces, and various bridges across the Arno River.