South Georgia and South Sandwich Islands is about 2.7 times smaller than Lebanon.

Lebanon is approximately 10,400 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 37.53% the size of Lebanon.
Tip: This to-scale comparison of Lebanon 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. Lebanon