French Southern and Antarctic Lands is about 313 times bigger than Saint Barthelemy.

Saint Barthelemy is approximately 25 sq km, while French Southern and Antarctic Lands is approximately 7,829 sq km, making French Southern and Antarctic Lands 31,216% larger than Saint Barthelemy.
Tip: This to-scale comparison of Saint Barthelemy vs. French Southern and Antarctic Lands uses the Mercator projection, which distorts the size of regions near the poles.

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