Sardinia world (22 centenarians/100,000 inhabitants). Sardinia is the first discovered Blue Zone, a demographic and/or geographic area in the world with an oversize concentration of centenarians and supercentenarians. In 2016 there were 50,346 foreign national residents, forming 3% of the total Sardinian population. The most represented nationalities were: Sardinia's most populated cities are Cagliari and Sassari. The Metropolitan City of Cagliari has 431,302 inhabitants, or about ¼ of the population of the entire island. Eurostat has identified in Sardinia two Functional Urban Areas: Cagliari, with 477,000 inhabitants, and Sassari, with 222,000 inhabitants. Sardinia is one of the five Italian autonomous regions,
Sardinia Nation a "nationalist" left-wing alliance with To the Left for Independence, a communist party, and other minor separatist groups, but gained only 0.5%, while Sale (iRS) 3.1%. In the 2014 regional election the party unsuccessfully sought to join the coalition led by Michela Murgia (centred on Project Republic of Sardinia), in list with alike separatist parties, and finally decided not to take part to the election. The electoral results of SN in Sardinia since 1994 are shown in the table below. Sardinia Nation Sardinia Nation (, SN) is a minor separatist and socialist political party in Sardinia, Italy. Its long-time leader