Country size comparison
compared to
Burundi is about 2.8 times smaller than Serbia.
Serbia is approximately 77,474 sq km, while Burundi is approximately 27,830 sq km, making Burundi 35.92% the size of Serbia. Meanwhile, the population of Serbia is ~6.7 million people (6.0 million more people live in Burundi).
Compare further: Burundi vs. Serbia