Country size comparison
compared to
Swaziland is about 22 times smaller than Japan.
Japan is approximately 377,915 sq km, while Swaziland is approximately 17,364 sq km, making Swaziland 4.59% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (123.1 million fewer people live in Swaziland).
Compare further: Swaziland vs. Japan