Saint Barthelemy is about 10 times smaller than Niue.

Niue is approximately 260 sq km, while Saint Barthelemy is approximately 25 sq km, making Saint Barthelemy 9.62% the size of Niue.
Tip: This to-scale comparison of Niue vs. Saint Barthelemy uses the Mercator projection, which distorts the size of regions near the poles.
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