Country size comparison
compared to
Brunei is about 3 times smaller than Swaziland.
Swaziland is approximately 17,364 sq km, while Brunei is approximately 5,765 sq km, making Brunei 33.2% the size of Swaziland. Meanwhile, the population of Swaziland is ~1.1 million people (643,707 fewer people live in Brunei).
Compare further: Brunei vs. Swaziland