Nauru is about 11,352 times smaller than Romania.

Romania is approximately 238,391 sq km, while Nauru is approximately 21 sq km, making Nauru 0.01% the size of Romania. Meanwhile, the population of Romania is ~18.5 million people (18.5 million fewer people live in Nauru).
Tip: This to-scale comparison of Romania vs. Nauru uses the Mercator projection, which distorts the size of regions near the poles.
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