Afghanistan dwarfs Europe: about 642,058 km² km² against 10,180,000 km² km². At true size Afghanistan is about 15.9× larger — the whole of Europe fits into Afghanistan roughly 15 times.
The old Mercator map treated both about equally (1.5× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Afghanistan fits 15× into Europe.