Macau is about 278 times smaller than French Southern and Antarctic Lands.

French Southern and Antarctic Lands is approximately 7,829 sq km, while Macau is approximately 28 sq km, making Macau 0.36% the size of French Southern and Antarctic Lands.
Tip: This to-scale comparison of French Southern and Antarctic Lands vs. Macau uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Macau vs. French Southern and Antarctic Lands