South Korea is about 4.2 times bigger than Vermont.

Vermont is approximately 23,956 sq km, while South Korea is approximately 99,720 sq km, making South Korea 316% larger than Vermont. Meanwhile, the population of Vermont is ~625,741 people (51.2 million more people live in South Korea).
Tip: This to-scale comparison of Vermont vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles.
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