Yemen covers 454,139 km² km² on the new Equal Earth world map — 0.3%% of all land on Earth, making it the 56th largest country in the world and the 14th largest in Asia. At 16° latitude Mercator only inflates Yemen by about 8%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Yemen is roughly the same size as Uzbekistan (447,381 km² km²).
You could fit 3 of Nepal inside Yemen.