New Caledonia is about 743 times bigger than Saint Barthelemy.

Saint Barthelemy is approximately 25 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 74,200% larger than Saint Barthelemy. Meanwhile, the population of Saint Barthelemy is ~7,103 people (290,057 more people live in New Caledonia).
This to-scale comparison of Saint Barthelemy vs. New Caledonia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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