Japan is about 1.9 times bigger than Nebraska.

Nebraska is approximately 199,099 sq km, while Japan is approximately 377,915 sq km, making Japan 90% larger than Nebraska. Meanwhile, the population of Nebraska is ~1.8 million people (122.4 million more people live in Japan).
Tip: This to-scale comparison of Nebraska vs. Japan uses the Mercator projection, which distorts the size of regions near the poles.
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