Europe dwarfs Namibia: about 10,180,000 km² km² against 824,750 km² km². At true size Europe is about 12.3× larger — the whole of Namibia fits into Europe roughly 12 times.
The old Mercator map treated both about equally (1× vs 1.2× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Namibia fits 12× into Europe.