British Indian Ocean Territory is about 13,268 times smaller than Pakistan.

Pakistan is approximately 796,095 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.01% the size of Pakistan. Meanwhile, the population of Pakistan is ~255.2 million people (255.2 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Pakistan vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.
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