Belgium is about 17 times smaller than Thailand.

Thailand is approximately 513,120 sq km, while Belgium is approximately 30,528 sq km, making Belgium 5.95% the size of Thailand. Meanwhile, the population of Thailand is ~69.6 million people (57.8 million fewer people live in Belgium).
This to-scale comparison of Thailand vs. Belgium uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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