Serbia is about 13 times bigger than Brunei.

Brunei is approximately 5,765 sq km, while Serbia is approximately 77,474 sq km, making Serbia 1,244% larger than Brunei. Meanwhile, the population of Brunei is ~478,054 people (6.3 million more people live in Serbia).
This to-scale comparison of Brunei vs. Serbia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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