Montana is about 1.6 times bigger than Ghana.

Ghana is approximately 238,533 sq km, while Montana is approximately 376,979 sq km, making Montana 58% larger than Ghana. Meanwhile, the population of Ghana is ~33.1 million people (32.1 million fewer people live in Montana).
Tip: This to-scale comparison of Ghana vs. Montana uses the Mercator projection, which distorts the size of regions near the poles.
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