South Georgia and South Sandwich Islands is about 129 times smaller than Spain.

Spain is approximately 505,370 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 0.77% the size of Spain.
Tip: This to-scale comparison of Spain 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. Spain