Saint Vincent and the Grenadines is about 20 times smaller than French Southern and Antarctic Lands.

French Southern and Antarctic Lands is approximately 7,829 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 4.97% the size of French Southern and Antarctic Lands.
Tip: This to-scale comparison of French Southern and Antarctic Lands vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Saint Vincent and the Grenadines vs. French Southern and Antarctic Lands