The smallest country of the world is

Russia
Vatican city
Brazil
Canada

The smallest country in the world is Vatican City, with a land area of only 0.44 square kilometers. It is an independent city-state enclaved within Rome, Italy. The Vatican City is the smallest country in the world by both area and population. It is a sovereign city-state enclosed within the city of Rome, Italy. With an area of approximately 49 hectares (121 acres), and a population of 825, it is the smallest sovereign state in the world by both area and population.