San Marino (/sæn məˈriːnoʊ/; Italian: [san 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 km (24 sq mi), with a population of 33,562. Its capital is the City of San Marino and its largest city is Serravalle. San Marino has the smallest population of all the members of the Council of Europe.