Shift Ranking of February 21: The World's Smallest Countries02/21/2014February 21, 20141. Vatican City (0.44 Sq.km) / 2. Monaco (2 Sq.km) / 3. Nauru (21 Sq.km) / 4. Tuvalu (26 Sq.km) / 5. San Marino (61 Sq.km) / Source: WorldmapCopy linkAdvertisement