Belize is about 383 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Belize is approximately 22,966 sq km, making Belize 38,177% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (419,924 more people live in Belize).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Belize uses the Mercator projection, which distorts the size of regions near the poles.
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