Sudan is about 4.9 times bigger than Japan.

Japan is approximately 377,915 sq km, while Sudan is approximately 1,861,484 sq km, making Sudan 393% larger than Japan. Meanwhile, the population of Japan is ~123.4 million people (71.7 million fewer people live in Sudan).
Tip: This to-scale comparison of Japan vs. Sudan uses the Mercator projection, which distorts the size of regions near the poles.
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