Papua New Guinea covers 464,271 km² km² on the new Equal Earth world map — 0.4%% of all land on Earth, making it the 55th largest country in the world and the 2nd largest in Oceania. At 6° latitude Mercator only inflates Papua New Guinea by about 1%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Papua New Guinea is roughly the same size as Cameroon (465,902 km² km²).
You could fit 3 of Nepal inside Papua New Guinea.