Nettuno is a town and comune of the Metropolitan City of Rome in the Lazio region of central Italy, 60 kilometres south of Rome. A resort city and agricultural center on the Tyrrhenian Sea, it has a population of approximately 50,000.

Metropolitan City of Rome Capital is an area of local government at the level of metropolitan city in the Lazio region of Italy. It comprises the territory of the city of Rome and 120 other comuni in the hinterland of the city. With more than 4.3 million inhabitants, it is the largest metropolitan city in Italy.