South Korea is about 5 times smaller than Thailand.

Thailand is approximately 513,120 sq km, while South Korea is approximately 99,720 sq km, making South Korea 19.43% the size of Thailand. Meanwhile, the population of Thailand is ~69.6 million people (17.8 million fewer people live in South Korea).
This to-scale comparison of Thailand vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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