Australia dwarfs Democratic Republic of the Congo: about 7,706,009 km² km² against 2,334,703 km² km². At true size Australia is about 3.3× larger — the whole of Democratic Republic of the Congo fits into Australia roughly 3 times.
Australia sits in Oceania, Democratic Republic of the Congo in Africa. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 3.3×.
The old Mercator map treated both about equally (1.2× 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 Australia.