Guinea covers 244,938 km² km² on the new Equal Earth world map — 0.2%% of all land on Earth, making it the 78th largest country in the world and the 31st largest in Africa. At 10° latitude Mercator only inflates Guinea by about 3%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Guinea is roughly the same size as United Kingdom (239,616 km² km²).
You could fit 3 of Czechia inside Guinea.