Ostuni is an Italian municipality of 31 197 inhabitants of the province of Brindisi in Puglia. Also known as the White City, due to its characteristic historic center that was once entirely painted with white lime, today only partially. Renowned tourist center, from 1994 to 2017 it received the Blue Flag and the five sails of Legambiente for cleaning the waters of its coast and for the quality of services offered, becoming the city with the cleanest sea in Italy. Moreover, in 2005, the Puglia Region recognized the municipality as a “tourist resort”