Closer than most people guess: Greenland (2,166,086 km²) is only about 15% larger than Sudan (1,878,000 km²).
Greenland sits in North America, Sudan in Africa. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 1.2×.
The old map muddied it further: Mercator inflates Greenland about 11.8× and Sudan about 1.1×, so on a Mercator-style map this pair appears 12.6× apart instead of the true 1.2×.
Sudan fits 1× into Greenland.
Greenland vs Sudan: key figures
| Measure | Greenland | Sudan |
|---|
| True area | 2,166,086 km² · #12 | 1,878,000 km² · #16 |
| Mercator inflation | 11.8× | 1.1× |
| Apparent on Mercator | 25,576,494 km² | 2,031,808 km² |