Myanmar covers 662,746 km² km² on the new Equal Earth world map — 0.5%% of all land on Earth, making it the 40th largest country in the world and the 10th largest in Asia. At 21° latitude Mercator only inflates Myanmar by about 15%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Myanmar is roughly the same size as Afghanistan (642,058 km² km²).
You could fit 4 of Tunisia inside Myanmar.