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 though it is most prevalent in winter and spring. It can blow quite strongly, but it is usually dry and cool. Sardinia is one of the most geologically ancient bodies of land in Europe. The island was populated in various waves of immigration from prehistory until recent times. The first people to settle in Sardinia during the Upper Paleolithic and the Mesolithic came from Continental Europe; the Paleolithic colonization of the island is demonstrated by the evidences in Oliena's "Corbeddu Cave"; in the Mesolithic some populations, particularly from present-day Tyrrhenian coast of Italy, managed to move to northern Sardinia via