Iran dwarfs Oceania: about 1,622,847 km² km² against 8,600,000 km² km². At true size Iran is about 5.3× larger — the whole of Oceania fits into Iran roughly 5 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 5× into Oceania.