Indonesia is about 5 times bigger than Japan.

Japan is approximately 377,915 sq km, while Indonesia is approximately 1,904,569 sq km, making Indonesia 404% larger than Japan. Meanwhile, the population of Japan is ~124.2 million people (153.1 million more people live in Indonesia).
This to-scale comparison of Japan vs. Indonesia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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