Niue is about 9 times smaller than Comoros.

Comoros is approximately 2,235 sq km, while Niue is approximately 260 sq km, making Niue 11.63% the size of Comoros. Meanwhile, the population of Comoros is ~882,847 people (880,914 fewer people live in Niue).
Tip: This to-scale comparison of Comoros vs. Niue uses the Mercator projection, which distorts the size of regions near the poles.
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