Oman covers 312,041 km² km² on the new Equal Earth world map — 0.2%% of all land on Earth, making it the 71st largest country in the world and the 20th largest in Asia. At 21° latitude Mercator only inflates Oman by about 14%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Oman is roughly the same size as Poland (312,566 km² km²).
You could fit 3 of Iceland inside Oman.