Tajikistan is about 350 times bigger than Heard Island and McDonald Islands.

Heard Island and McDonald Islands is approximately 412 sq km, while Tajikistan is approximately 144,100 sq km, making Tajikistan 34,876% larger than Heard Island and McDonald Islands.
Tip: This to-scale comparison of Heard Island and McDonald Islands vs. Tajikistan uses the Mercator projection, which distorts the size of regions near the poles.

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