| True area | On the old Mercator map | Distortion vs truth |
|---|
| Cook Islands | 62 km² | 71 km² | 1.2× |
| Greenland | 2,154,754 km² | 25,447,645 km² | 11.8× |
| Africa | 30,370,000 km² | — | 1× |
Old maps drew Cook Islands at about 71 km² km². The truth is 62 km² km² — a difference of 15%% that school atlases carried for centuries.