South Korea is about 165 times bigger than Madrid.

Madrid is approximately 604 sq km, while South Korea is approximately 99,720 sq km, making South Korea 16,401% larger than Madrid.
Tip: This to-scale comparison of Madrid vs. South Korea uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.