Myanmar dwarfs South America: about 662,746 km² km² against 17,840,000 km² km². At true size Myanmar is about 26.9× larger — the whole of South America fits into Myanmar roughly 26 times.
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.
Myanmar fits 26× into South America.