South Georgia and South Sandwich Islands is about 27 times smaller than Tennessee.

Tennessee is approximately 106,752 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 3.66% the size of Tennessee.
Tip: This to-scale comparison of Tennessee 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. Tennessee