Western Sahara is about 5,429 times bigger than Bouvet Island.

Bouvet Island is approximately 49 sq km, while Western Sahara is approximately 266,000 sq km, making Western Sahara 542,757% larger than Bouvet Island.
Tip: This to-scale comparison of Bouvet Island vs. Western Sahara uses the Mercator projection, which distorts the size of regions near the poles.