Eritrea covers 123,678 km² km² on the new Equal Earth world map — 0.1%% of all land on Earth, making it the 99th largest country in the world and the 37th largest in Africa. At 15° latitude Mercator only inflates Eritrea 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: Eritrea is roughly the same size as Greece (130,177 km² km²).