British Indian Ocean Territory is about 18 times smaller than Hong Kong.

Hong Kong is approximately 1,108 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 5.42% the size of Hong Kong. Meanwhile, the population of Hong Kong is ~7.5 million people (7.5 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Hong Kong 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. Hong Kong

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