Fiorentino is one of the nine castelli of San Marino. It occupies an area of 6.56 km2 and is the fourth smallest castello in the country by land area. As of 2023, it had a population of 2,615 inhabita

Serravalle is one of the nine castelli of San Marino. It has a population of 11,226 inhabitants and an area of 10.53 km2. It is both the most populated and densely populated municipality in San Marino