South Korea is about 4 times smaller than California.

California is approximately 403,882 sq km, while South Korea is approximately 99,720 sq km, making South Korea 24.69% the size of California. Meanwhile, the population of California is ~37.3 million people (14.6 million more people live in South Korea).
This to-scale comparison of California vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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