British Indian Ocean Territory is about 18,405 times smaller than Ethiopia.

Ethiopia is approximately 1,104,300 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.01% the size of Ethiopia. Meanwhile, the population of Ethiopia is ~135.5 million people (135.5 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Ethiopia vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.
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