Isle of Man is about 40 times smaller than Belize.

Belize is approximately 22,966 sq km, while Isle of Man is approximately 572 sq km, making Isle of Man 2.49% the size of Belize. Meanwhile, the population of Belize is ~422,924 people (338,806 fewer people live in Isle of Man).
Tip: This to-scale comparison of Belize vs. Isle of Man uses the Mercator projection, which distorts the size of regions near the poles.
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