Belgium is about 1.5 times bigger than Slovenia.

Slovenia is approximately 20,273 sq km, while Belgium is approximately 30,528 sq km, making Belgium 51% larger than Slovenia. Meanwhile, the population of Slovenia is ~2.1 million people (9.7 million more people live in Belgium).
This to-scale comparison of Slovenia vs. Belgium uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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