Japan is about 3.8 times bigger than South Korea.

South Korea is approximately 99,720 sq km, while Japan is approximately 377,915 sq km, making Japan 279% larger than South Korea. Meanwhile, the population of South Korea is ~51.8 million people (72.4 million more people live in Japan).
This to-scale comparison of South Korea vs. Japan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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