Democratic Republic of the Congo dwarfs South America: about 2,334,703 km² km² against 17,840,000 km² km². At true size Democratic Republic of the Congo is about 7.6× larger — the whole of South America fits into Democratic Republic of the Congo roughly 7 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.
Democratic Republic of the Congo fits 7× into South America.