Country size comparison
compared to
Eritrea is about 3.2 times smaller than Japan.
Japan is approximately 377,915 sq km, while Eritrea is approximately 117,600 sq km, making Eritrea 31.12% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (118.0 million fewer people live in Eritrea).
Compare further: Eritrea vs. Japan