Guam is about 11 times smaller than Brunei.

Brunei is approximately 5,765 sq km, while Guam is approximately 544 sq km, making Guam 9.44% the size of Brunei. Meanwhile, the population of Brunei is ~478,054 people (308,968 fewer people live in Guam).
This to-scale comparison of Brunei vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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