Ethiopia dwarfs Oceania: about 1,131,761 km² km² against 8,600,000 km² km². At true size Ethiopia is about 7.6× larger — the whole of Oceania fits into Ethiopia 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.
Ethiopia fits 7× into Oceania.