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 by L'Unione Sarda and also the first Italian UMTS company was founded on the island. Today Sardinia is the second Italian region, after Lombardy, for investments in startups (owning the 20% of the Italian venture capital). On the island are headquartered some telecommunication companies and internet service providers, such as Tiscali and the Mediterranean Skylogic Teleport, a ground station controlled by satellite provider Eutelsat. Sardinia is the Italian region with the highest e-intensity index, after the Aosta Valley (index measuring the relative maturity of Internet economies on the basis of three factors: enablement, engagement, and expenditure) and the region with