Country size comparison
compared to
Swaziland is about 3 times bigger than Brunei.
Brunei is approximately 5,765 sq km, while Swaziland is approximately 17,364 sq km, making Swaziland 201% larger than Brunei. Meanwhile, the population of Brunei is ~478,054 people (643,707 more people live in Swaziland).
Compare further: Swaziland vs. Brunei