| True area | On the old Mercator map | Distortion vs truth |
|---|
| Puerto Rico | 8,936 km² | 9,919 km² | 1.1× |
| Greenland | 2,154,754 km² | 25,447,645 km² | 11.8× |
| Africa | 30,370,000 km² | — | 1× |
Old maps drew Puerto Rico at about 9,919 km² km². The truth is 8,936 km² km² — a difference of 11%% that school atlases carried for centuries.