South Korea is around the same size as Portugal.

Portugal is approximately 92,090 sq km, while South Korea is approximately 99,720 sq km, making South Korea 8% larger than Portugal. Meanwhile, the population of Portugal is ~10.2 million people (41.6 million more people live in South Korea).
This to-scale comparison of Portugal vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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