San Marino (i; Italian: [sam maˈriːno]), officially the Republic of San Marino (Italian: Repubblica di San Marino), also known as the Most Serene Republic of San Marino (Italian: Serenissima Repubblica di San Marino), is an enclaved microstate surrounded by Italy, situated on the Italian Peninsula on the northeastern side of the Apennine Mountains. Its size is just over 61 km2 (24 sq mi) and has an estimated population of about 32,000. Its capital is the City of San Marino and its largest city is Dogana. San Marino has the smallest population of all the members of the Council of Europe.
San Marino claims to be the oldest surviving sovereign state and constitutional republic in the world, as the continuation of the monastic community founded on 3 September 301, by stonecutter Marinus of Arba. Legend has it that Marinus left Rab, then the Roman colony of Arba, in 257 when the future emperor Diocletian issued a decree calling for the reconstruction of the city walls of Rimini, which had been destroyed by Liburnian pirates.