Iran is about 3,833 times bigger than Barbados.

Barbados is approximately 430 sq km, while Iran is approximately 1,648,195 sq km, making Iran 383,201% larger than Barbados. Meanwhile, the population of Barbados is ~302,674 people (86.5 million more people live in Iran).
This to-scale comparison of Barbados vs. Iran uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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