Samoa is about 7 times bigger than Heard Island and McDonald Islands.

Heard Island and McDonald Islands is approximately 412 sq km, while Samoa is approximately 2,831 sq km, making Samoa 587% larger than Heard Island and McDonald Islands.
Tip: This to-scale comparison of Heard Island and McDonald Islands vs. Samoa uses the Mercator projection, which distorts the size of regions near the poles.
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