San Marino (; ), officially the Republic of San Marino , also known as the Most Serene Republic of San Marino , is an enclaved microstate surrounded by Italy, situated on the Italian Peninsula on the north-eastern side of the Apennine Mountains. Its size is just over 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.