Japan is about 2.1 times bigger than North Dakota.

North Dakota is approximately 178,647 sq km, while Japan is approximately 377,915 sq km, making Japan 112% larger than North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (123.5 million more people live in Japan).
Tip: This to-scale comparison of North Dakota vs. Japan uses the Mercator projection, which distorts the size of regions near the poles.
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