British Indian Ocean Territory is about 439 times smaller than Rwanda.

Rwanda is approximately 26,338 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.23% the size of Rwanda. Meanwhile, the population of Rwanda is ~14.6 million people (14.6 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Rwanda vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.
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