Belgium is about 2.5 times smaller than Serbia.

Serbia is approximately 77,474 sq km, while Belgium is approximately 30,528 sq km, making Belgium 39.4% the size of Serbia. Meanwhile, the population of Serbia is ~6.7 million people (5.1 million more people live in Belgium).
This to-scale comparison of Serbia vs. Belgium uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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