| True area | On the old Mercator map | Distortion vs truth |
|---|
| Oman | 312,041 km² | 355,727 km² | 1.1× |
| Greenland | 2,154,754 km² | 25,447,645 km² | 11.8× |
| Africa | 30,370,000 km² | — | 1× |
Old maps drew Oman at about 355,727 km² km². The truth is 312,041 km² km² — a difference of 14%% that school atlases carried for centuries.