Croatia is about 2.1 times smaller than Eritrea.

Eritrea is approximately 117,600 sq km, while Croatia is approximately 56,594 sq km, making Croatia 48.12% the size of Eritrea. Meanwhile, the population of Eritrea is ~3.6 million people (269,197 more people live in Croatia).
Tip: This to-scale comparison of Eritrea vs. Croatia uses the Mercator projection, which distorts the size of regions near the poles.
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