Naples is the regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 909,048 within the city's administrative limits as of 2022. Its province-level municipality is the third most populous metropolitan city in Italy with a population of 3,115,320 residents, and its metropolitan area stretches beyond the boundaries of the city wall for approximately 30 kilometres. Naples plays also a key international role in international diplomacy, since it is home to NATO's Allied Joint Force Command Naples and of the Parliamentary Assembly of the Mediterranean.