It is hard to represent our spherical world on flat piece of paper. Every map projection introduces distortion, and each has its own set of problems. One of the most common criticisms of the Mercator map is that it exaggerates the size of countries nearer the poles, while downplaying the size of those near the equator.
On the Mercator projection Greenland appears to be roughly the same size as Africa. In reality, Greenland is 0.8 million sq. miles and Africa is 11.6 million sq. miles, nearly 14 and a half times larger. The True Size Of... shows just how big the world actually is.