Guam is about 243 times smaller than Greece.

Greece is approximately 131,957 sq km, while Guam is approximately 544 sq km, making Guam 0.41% the size of Greece. Meanwhile, the population of Greece is ~10.5 million people (10.4 million fewer people live in Guam).
This to-scale comparison of Greece vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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