South America dwarfs South Sudan: about 17,840,000 km² km² against 623,998 km² km². At true size South America is about 28.6× larger — the whole of South Sudan fits into South America roughly 28 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 28× into South America.