Closer than most people guess: Iran (1,622,847 km² km²) is only about 25%% larger than Peru (1,296,279 km² km²).
Iran sits in Asia, Peru in South America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 1.3×.
The old map muddied it further: Mercator inflates Iran about 1.4× and Peru about 1×, so on a Mercator-style map this pair appears 1.7× apart instead of the true 1.3×.
Peru fits 1× into Iran.