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Catania is the second-largest city in the autonomous island region of Sicily in Italy, after Palermo, both by area and by population. Despite being the second largest city of the island, Catania is the centre of the most densely populated Sicilian conurbation, which is among the largest in Italy. It has important road and rail transport infrastructures, and hosts the main airport of Sicily. The city is located on Sicily's east coast, facing the Ionian Sea at the base of the active volcano Mount Etna. It is the capital of the 58-municipality province known as the Metropolitan City of Catania, which is the seventh-largest metropolitan area in Italy. The population of the city proper is 296,984, while the population of the metropolitan city is 1,067,550.