South Korea is about 2.9 times smaller than Nevada.

Nevada is approximately 284,448 sq km, while South Korea is approximately 99,720 sq km, making South Korea 35.06% the size of Nevada. Meanwhile, the population of Nevada is ~2.7 million people (49.1 million more people live in South Korea).
Tip: This to-scale comparison of Nevada vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles.
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