Romania is about 11,352 times bigger than Nauru.

Nauru is approximately 21 sq km, while Romania is approximately 238,391 sq km, making Romania 1,135,095% larger than Nauru. Meanwhile, the population of Nauru is ~9,811 people (18.5 million more people live in Romania).
Tip: This to-scale comparison of Nauru vs. Romania uses the Mercator projection, which distorts the size of regions near the poles.
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