Country size comparison
compared to
Burundi is about 1.6 times bigger than Swaziland.
Swaziland is approximately 17,364 sq km, while Burundi is approximately 27,830 sq km, making Burundi 60% larger than Swaziland. Meanwhile, the population of Swaziland is ~1.1 million people (11.6 million more people live in Burundi).
Compare further: Burundi vs. Swaziland