Heard Island and McDonald Islands is about 27 times smaller than Gambia.

Gambia is approximately 11,300 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 3.65% the size of Gambia.
Tip: This to-scale comparison of Gambia vs. Heard Island and McDonald Islands uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Heard Island and McDonald Islands vs. Gambia

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