Burundi is about 7 times bigger than South Georgia and South Sandwich Islands.

South Georgia and South Sandwich Islands is approximately 3,903 sq km, while Burundi is approximately 27,830 sq km, making Burundi 613% larger than South Georgia and South Sandwich Islands.
Tip: This to-scale comparison of South Georgia and South Sandwich Islands vs. Burundi uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Burundi vs. South Georgia and South Sandwich Islands