Greenland is clearly the larger of the two: about 2,166,086 km² against 1,648,195 km², roughly 1.3× at true size. Drag one onto the other on the map above to feel the gap.
Greenland sits in North America, Iran in Asia. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 1.3×.
The old map muddied it further: Mercator inflates Greenland about 11.8× and Iran about 1.4×, so on a Mercator-style map this pair appears 11× apart instead of the true 1.3×.
Iran fits 1× into Greenland.
Greenland vs Iran: key figures
| Measure | Greenland | Iran |
|---|
| True area | 2,166,086 km² · #12 | 1,648,195 km² · #18 |
| Mercator inflation | 11.8× | 1.4× |
| Apparent on Mercator | 25,576,494 km² | 2,318,516 km² |