Poland is about 5,211 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Poland is approximately 312,685 sq km, making Poland 521,042% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (36.4 million more people live in Poland).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Poland uses the Mercator projection, which distorts the size of regions near the poles.
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