Cayman Islands is about 4.2 times smaller than Hong Kong.

Hong Kong is approximately 1,108 sq km, while Cayman Islands is approximately 264 sq km, making Cayman Islands 23.83% the size of Hong Kong. Meanwhile, the population of Hong Kong is ~7.3 million people (7.2 million fewer people live in Cayman Islands).
This to-scale comparison of Hong Kong vs. Cayman Islands uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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