Any attempt to flatten a sphere into a rectangle has to distort something, whether it's area, shape, distance, or direction, because a curved surface simply can't be unrolled onto a flat one without stretching or tearing it somewhere. Mathematicians formalized this limitation through Carl Friedrich Gauss's Theorema Egregium, which proves no flat map can preserve every property of the globe at once.
The Mercator projection, created by Flemish cartographer Gerardus Mercator in 1569, was designed to solve a specific navigation problem: it draws any straight compass bearing as a straight line on the map, which made it extremely useful for sailors plotting a course. That same trick, though, comes at the cost of badly exaggerating area the closer you get to the poles.
The Impossible Problem of Flattening a Sphere
Why Greenland Looks as Big as Africa
On a standard Mercator map, Greenland appears roughly comparable in size to Africa. In reality Africa is about 14 times larger; Greenland's area is closer to that of the Democratic Republic of Congo alone. The distortion grows the farther a landmass sits from the equator, which happens to inflate wealthy Northern Hemisphere countries and shrink much of the Global South.
Alternatives exist that trade one distortion for another. The Gall-Peters projection preserves accurate area but stretches shapes noticeably near the poles, while the Robinson projection, used by National Geographic from 1988 to 1998, compromises between area and shape accuracy rather than optimizing either one perfectly.
Sources
- National Geographic Society β map projections explained
- Britannica β the Mercator projection and its distortion
- USGS β cartography and projection fundamentals
FAQ
Why is the Mercator projection still so widely used if it distorts size?
It preserves straight compass bearings, which made it genuinely useful for maritime navigation, and its familiarity has kept it as the default for web maps and classrooms long after that navigational advantage stopped mattering to most users.
Is there a map projection that gets everything right?
No, mathematically no flat projection can simultaneously preserve area, shape, distance, and direction, so every world map involves a deliberate tradeoff between those properties.
How much bigger is Africa than Greenland in reality?
Africa's actual land area is roughly 14 times larger than Greenland's, despite the two often appearing close in size on a standard Mercator map.
About the Author
We reference National Geographic Society, Britannica, USGS to explain the background and current understanding of this topic.
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