South Georgia and South Sandwich Islands is about 237 times smaller than Nigeria.

Nigeria is approximately 923,768 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 0.42% the size of Nigeria.
Tip: This to-scale comparison of Nigeria 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. Nigeria