Madagascar is about 1,425 times bigger than Heard Island and McDonald Islands.

Heard Island and McDonald Islands is approximately 412 sq km, while Madagascar is approximately 587,041 sq km, making Madagascar 142,386% larger than Heard Island and McDonald Islands.
Tip: This to-scale comparison of Heard Island and McDonald Islands vs. Madagascar uses the Mercator projection, which distorts the size of regions near the poles.

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