Nauru is about 15 times smaller than Malta.

Malta is approximately 316 sq km, while Nauru is approximately 21 sq km, making Nauru 6.65% the size of Malta. Meanwhile, the population of Malta is ~464,186 people (454,375 fewer people live in Nauru).
Tip: This to-scale comparison of Malta vs. Nauru uses the Mercator projection, which distorts the size of regions near the poles.
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