Cook Islands is about 5 times bigger than Pitcairn Islands.

Pitcairn Islands is approximately 47 sq km, while Cook Islands is approximately 236 sq km, making Cook Islands 402% larger than Pitcairn Islands. Meanwhile, the population of Pitcairn Islands is ~50 people (8,078 more people live in Cook Islands).
This to-scale comparison of Pitcairn Islands vs. Cook Islands uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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