British Indian Ocean Territory is about 5,497 times smaller than Malaysia.

Malaysia is approximately 329,847 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.02% the size of Malaysia. Meanwhile, the population of Malaysia is ~36.0 million people (36.0 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Malaysia vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.
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