Japan is about 66 times bigger than Brunei.

Brunei is approximately 5,765 sq km, while Japan is approximately 377,915 sq km, making Japan 6,455% larger than Brunei. Meanwhile, the population of Brunei is ~478,054 people (123.7 million more people live in Japan).
This to-scale comparison of Brunei vs. Japan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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