Heard Island and McDonald Islands is about 1,123 times smaller than Papua New Guinea.

Papua New Guinea is approximately 462,840 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 0.09% the size of Papua New Guinea.
Tip: This to-scale comparison of Papua New Guinea vs. Heard Island and McDonald Islands uses the Mercator projection, which distorts the size of regions near the poles.

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