Africa dwarfs Namibia: about 30,370,000 km² km² against 824,750 km² km². At true size Africa is about 36.8× larger — the whole of Namibia fits into Africa roughly 36 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 36× into Africa.