Democratic Republic of the Congo is about 300 times bigger than French Southern and Antarctic Lands.

French Southern and Antarctic Lands is approximately 7,829 sq km, while Democratic Republic of the Congo is approximately 2,344,858 sq km, making Democratic Republic of the Congo 29,851% larger than French Southern and Antarctic Lands.
Tip: This to-scale comparison of French Southern and Antarctic Lands vs. Democratic Republic of the Congo uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Democratic Republic of the Congo vs. French Southern and Antarctic Lands