Which of the following is smallest country?

Vatican City is the smallest country in the world. Vatican City or Vatican City State, officially Stato della Citta del Vaticano which translates literally as “State of the City of the Vatican” is a landlocked sovereign city-state whose territory consists of a walled enclave within the city of Rome. It has an area of approximately 44 hectares (110 acres) and a population of just over 800.