Heard Island and McDonald Islands is about 49 times smaller than Slovenia.

Slovenia is approximately 20,273 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 2.03% the size of Slovenia.
Tip: This to-scale comparison of Slovenia vs. Heard Island and McDonald Islands uses the Mercator projection, which distorts the size of regions near the poles.

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