Antigua and Barbuda is about 409 times smaller than Cambodia.

Cambodia is approximately 181,035 sq km, while Antigua and Barbuda is approximately 443 sq km, making Antigua and Barbuda 0.24% the size of Cambodia. Meanwhile, the population of Cambodia is ~16.7 million people (16.6 million fewer people live in Antigua and Barbuda).
Tip: This to-scale comparison of Cambodia vs. Antigua and Barbuda uses the Mercator projection, which distorts the size of regions near the poles.
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