Africa dwarfs South Sudan: about 30,370,000 km² km² against 623,998 km² km². At true size Africa is about 48.7× larger — the whole of South Sudan fits into Africa roughly 48 times.
The old Mercator map treated both about equally (1× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
South Sudan fits 48× into Africa.