Vatican City

Vatican City i/ˈvætɨkən ˈsɪti/, or Vatican City State,[11] in Italian officially Stato della Città del Vaticano (pronounced [ˈstaːto della t͡ʃitˈta del vatiˈkaːno]), is a landlocked sovereign city-state whose territory consists of a walled enclave within the city of Rome, Italy. It has an area of approximately 44 hectares (110 acres), and a population of just over 800. This makes Vatican City the smallest independent state in the world by both area and population.

It is distinct from the Holy See

More information on the Wikipedia page