Closer than most people guess: Greenland (2,166,086 km²) is only about 14% larger than Indonesia (1,904,569 km²).
Greenland sits in North America, Indonesia 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 1.1×.
The old map muddied it further: Mercator inflates Greenland about 11.8× and Indonesia about 1.00×, so on a Mercator-style map this pair appears 13.4× apart instead of the true 1.1×.
Indonesia fits 1× into Greenland.
Greenland vs Indonesia: key figures
| Measure | Greenland | Indonesia |
|---|
| True area | 2,166,086 km² · #12 | 1,904,569 km² · #15 |
| Mercator inflation | 11.8× | 1.00× |
| Apparent on Mercator | 25,576,494 km² | 1,907,616 km² |