Maine is about 1.2 times smaller than South Korea.

South Korea is approximately 99,720 sq km, while Maine is approximately 79,931 sq km, making Maine 80.16% the size of South Korea. Meanwhile, the population of South Korea is ~51.8 million people (50.5 million fewer people live in Maine).
Tip: This to-scale comparison of South Korea vs. Maine uses the Mercator projection, which distorts the size of regions near the poles.
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