Antigua and Barbuda is about 148 times smaller than Sri Lanka.

Sri Lanka is approximately 65,610 sq km, while Antigua and Barbuda is approximately 443 sq km, making Antigua and Barbuda 0.67% the size of Sri Lanka. Meanwhile, the population of Sri Lanka is ~23.2 million people (23.1 million fewer people live in Antigua and Barbuda).
Tip: This to-scale comparison of Sri Lanka vs. Antigua and Barbuda uses the Mercator projection, which distorts the size of regions near the poles.
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