South Georgia and South Sandwich Islands is about 186 times bigger than Nauru.

Nauru is approximately 21 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 18,486% larger than Nauru.
Tip: This to-scale comparison of Nauru vs. South Georgia and South Sandwich Islands uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: South Georgia and South Sandwich Islands vs. Nauru