Belize is about 1.7 times bigger than Montenegro.

Montenegro is approximately 13,812 sq km, while Belize is approximately 22,966 sq km, making Belize 66% larger than Montenegro. Meanwhile, the population of Montenegro is ~623,129 people (200,205 fewer people live in Belize).
Tip: This to-scale comparison of Montenegro vs. Belize uses the Mercator projection, which distorts the size of regions near the poles.
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