Europe dwarfs Tanzania: about 10,180,000 km² km² against 945,781 km² km². At true size Europe is about 10.8× larger — the whole of Tanzania fits into Europe roughly 10 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.
Tanzania fits 10× into Europe.