British Indian Ocean Territory is about 429 times smaller than Macedonia.

Macedonia is approximately 25,713 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.23% the size of Macedonia. Meanwhile, the population of Macedonia is ~1.8 million people (1.8 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Macedonia vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: British Indian Ocean Territory vs. Macedonia

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