Argentina is about 7 times bigger than Montana.

Montana is approximately 376,979 sq km, while Argentina is approximately 2,780,400 sq km, making Argentina 638% larger than Montana. Meanwhile, the population of Montana is ~989,415 people (45.3 million more people live in Argentina).
Tip: This to-scale comparison of Montana vs. Argentina uses the Mercator projection, which distorts the size of regions near the poles.
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