text: what is the seventh smallest country in the world?   7th-marshal islands (181 sq. km).  6th-liechtenstein (160 sq. km)  5th-san marino (61 sq. km)  4th-tuvalu (26 sq. km)  3rd-nauru (21 sq. km)  2nd-monaco (2 sq. km)  1st-vatican city (0.5 sq. km).