South Korea is 0.55 times as big as Missouri (US)
South Korea, officially the Republic of Korea, is a country in East Asia, constituting the southern part of the Korean Peninsula, and sharing a land border with North Korea. 25 million people, around half of the country's population of more than 51 million people, live in the Seoul Capital Area, the fifth-largest metropolitan area in the world.
Missouri is a state in the Midwestern United States. The state is the 21st-most extensive in area. Missouri is bordered by eight states (tied for the most with Tennessee) - Iowa to the north, Illinois, Kentucky and Tennessee (via the Mississippi River) to the east, Arkansas to the south and Oklahoma, Kansas and Nebraska to the west.