Ghana is about 13 times bigger than New Caledonia.

New Caledonia is approximately 18,575 sq km, while Ghana is approximately 238,533 sq km, making Ghana 1,184% larger than New Caledonia. Meanwhile, the population of New Caledonia is ~295,333 people (34.8 million more people live in Ghana).
Tip: This to-scale comparison of New Caledonia vs. Ghana uses the Mercator projection, which distorts the size of regions near the poles.
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