San Marino, officially the Republic of San Marino. Italian: Repubblica di San Marino, also known as the Most Serene Republic of San Marino), is a state situated on the Italian Peninsula on the eastern side of the Apennine Mountains. It is an enclave surrounded by Italy. Its size is just over 61 km2 (24 sq mi) with an estimated population of over 30,000. Its capital is the City of San Marino. San Marino has the smallest population of all the members of the Council of Europe.
The constitution of San Marino, enacted in 1600, is the world’s oldest constitution still in effect