French Southern and Antarctic Lands is about 44 times smaller than Republic of the Congo.

Republic of the Congo is approximately 342,000 sq km, while French Southern and Antarctic Lands is approximately 7,829 sq km, making French Southern and Antarctic Lands 2.29% the size of Republic of the Congo.
Tip: This to-scale comparison of Republic of the Congo vs. French Southern and Antarctic Lands uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: French Southern and Antarctic Lands vs. Republic of the Congo