| True area | On the old Mercator map | Distortion vs truth |
|---|
| Montenegro | 13,663 km² | 25,413 km² | 1.9× |
| Greenland | 2,154,754 km² | 25,447,645 km² | 11.8× |
| Africa | 30,370,000 km² | — | 1× |
Old maps drew Montenegro at about 25,413 km² km². The truth is 13,663 km² km² — a difference of 86%% that school atlases carried for centuries.