Iran dwarfs South America: about 1,622,847 km² km² against 17,840,000 km² km². At true size Iran is about 11× larger — the whole of South America fits into Iran roughly 10 times.
The old Mercator map treated both about equally (1.4× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Iran fits 10× into South America.