Congo covers 346,857 km² km² on the new Equal Earth world map — 0.3%% of all land on Earth, making it the 65th largest country in the world and the 27th largest in Africa. At 1° latitude Mercator only inflates Congo by about 0%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Congo is roughly the same size as Germany (356,163 km² km²).
You could fit 3 of Cuba inside Congo.