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 the greater flamingo. Conversely, Sardinia lacks many species common on the European continent, such as the viper, wolf, bear and marmot. The island has also long been used for grazing flocks of indigenous Sardinian sheep. The Sardinian Anglo-Arab is a horse breed that was established in Sardinia, where it has been selectively bred for more than one hundred years. Three different breeds of dogs are peculiar to Sardinia: the Pastore Fonnese, Dogo Sardo and Levriero Sardo. In Sardinia there are more than 100 beaches. The geology of the island provides a variety of beaches, for example beaches made of fine