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,
Flag of Sardinia ruled by the Savoy House Flag of Sardinia The flag of Sardinia, called the flag of the Four Moors or simply the Four Moors (; in Logudorese or "Is cuattru morus" in Campidanese), is the flag of the island of Sardinia (Italy), first officially adopted by the autonomous region in 1950 with a revision in 1999, describing it as a "white field with a red cross and a bandaged Moor's head facing away from the left (the edge close to the mast) in each quarter" (Regional Law 15 April 1999, n. 10, Article 1.). It was also the historical flag