Colombia dwarfs Oceania: about 1,139,434 km² km² against 8,600,000 km² km². At true size Colombia is about 7.5× larger — the whole of Oceania fits into Colombia 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.
Colombia fits 7× into Oceania.