Northern Mariana Islands is about 9 times bigger than Bouvet Island.

Bouvet Island is approximately 49 sq km, while Northern Mariana Islands is approximately 464 sq km, making Northern Mariana Islands 847% larger than Bouvet Island.
Tip: This to-scale comparison of Bouvet Island vs. Northern Mariana Islands uses the Mercator projection, which distorts the size of regions near the poles.
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