South Korea is about 20 times bigger than Delaware.

Delaware is approximately 5,060 sq km, while South Korea is approximately 99,720 sq km, making South Korea 1,871% larger than Delaware. Meanwhile, the population of Delaware is ~897,934 people (50.9 million more people live in South Korea).
Tip: This to-scale comparison of Delaware vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles.
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