Gergei is a comune in the Province of South Sardinia in the Italian region Sardinia, located about 50 kilometres north of Cagliari. As of 31 Deceā¦Gergei is a comune in the Province of South Sardinia in the Italian region Sardinia, located about 50 kilometres north of Cagliari. As of 31 December 2004, it had a population of 1,413 and an area of 36.1 square kilometres.