Heard Island and McDonald Islands is about 1.8 times smaller than Dominica.

Dominica is approximately 751 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 54.86% the size of Dominica.
Tip: This to-scale comparison of Dominica 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. Dominica

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