Tanzania covers 945,781 km² km² on the new Equal Earth world map — 0.7%% of all land on Earth, making it the 31st largest country in the world and the 13th largest in Africa. At 6° latitude Mercator only inflates Tanzania 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: Tanzania is roughly the same size as Venezuela (914,310 km² km²).
You could fit 3 of Poland inside Tanzania.