| True area | On the old Mercator map | Distortion vs truth |
|---|
| Mongolia | 1,560,428 km² | 3,354,920 km² | 2.2× |
| Greenland | 2,154,754 km² | 25,447,645 km² | 11.8× |
| Africa | 30,370,000 km² | — | 1× |
Old maps drew Mongolia at about 3,354,920 km² km². The truth is 1,560,428 km² km² — a difference of 115%% that school atlases carried for centuries.