Cuba is about 3.6 times bigger than Belgium.

Belgium is approximately 30,528 sq km, while Cuba is approximately 110,860 sq km, making Cuba 263% larger than Belgium. Meanwhile, the population of Belgium is ~11.9 million people (1.0 million fewer people live in Cuba).
Tip: This to-scale comparison of Belgium vs. Cuba uses the Mercator projection, which distorts the size of regions near the poles.
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