South Korea is about 19 times smaller than Indonesia.

Indonesia is approximately 1,904,569 sq km, while South Korea is approximately 99,720 sq km, making South Korea 5.24% the size of Indonesia. Meanwhile, the population of Indonesia is ~277.3 million people (225.5 million fewer people live in South Korea).
This to-scale comparison of Indonesia vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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