South Dakota is about 1.5 times bigger than Greece.

Greece is approximately 131,957 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 49% larger than Greece. Meanwhile, the population of Greece is ~10.5 million people (9.7 million fewer people live in South Dakota).
Tip: This to-scale comparison of Greece vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles.
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