Democratic Republic of the Congo dwarfs Oceania: about 2,334,703 km² km² against 8,600,000 km² km². At true size Democratic Republic of the Congo is about 3.7× larger — the whole of Oceania fits into Democratic Republic of the Congo roughly 3 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 3× into Oceania.