Djibouti is about 16 times smaller than Japan.

Japan is approximately 377,915 sq km, while Djibouti is approximately 23,200 sq km, making Djibouti 6.14% the size of Japan. Meanwhile, the population of Japan is ~123.4 million people (122.2 million fewer people live in Djibouti).
Tip: This to-scale comparison of Japan vs. Djibouti uses the Mercator projection, which distorts the size of regions near the poles.
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