Namibia dwarfs North America: about 824,750 km² km² against 24,710,000 km² km². At true size Namibia is about 30× larger — the whole of North America fits into Namibia roughly 29 times.
The old Mercator map treated both about equally (1.2× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Namibia fits 29× into North America.