A
Mercator
Preserves local angles and makes constant compass bearings straight—excellent for marine navigation.
- Keeps local shape + bearing
- Sacrifices relative area
01 THE PROJECTION PROBLEM
The map you know
is not the world.
The Mercator projection keeps compass bearings straight—but stretches area more and more as you move toward the poles. It is brilliant for navigation and deeply misleading for comparing size.
AREA INFLATION4.0×
at 60° latitude
Mercator area scale = sec²(latitude). At 60°, one unit of land occupies roughly 4.0 units on the map.
1569 Mercator publishes his world map
4× area inflation at 60° north or south
∞ the poles can never be shown
02 THE BIGGEST VISUAL MYTH
Greenland looks like Africa.
Africa is about 14× larger.
Africa30.37M km²
Greenland2.17M km²
A high-latitude illusion can become a low-resolution worldview.
On a Mercator map, Greenland's position around 60–80° north multiplies its visual area. Much of Africa sits near the equator, where inflation is small. The result makes them look comparable even though Africa is roughly fourteen times larger.
National Geographic’s comparison ↗03 EVERY MAP MAKES A TRADE
Mercator isn't broken.
It was built for a job.
B
Equal Earth
Preserves relative area, so a square kilometer has the same visual weight everywhere on the map.
- Keeps relative area
- Sacrifices exact local shape
C
The globe
The only surface that shows the planet without projection distortion—because it never flattens it.
- Keeps global geometry
- Sacrifices seeing it all at once
04 WHY IT ENDURED
Sailors needed a straight line.
The internet needed square tiles.
Navigation first
Gerardus Mercator's grid turns constant-bearing routes, called rhumb lines, into straight lines.
The classroom wall
A rectangular world fits atlases, posters, and screens—giving a specialized navigation map enormous cultural reach.
Web Mercator
Online maps use a related projection because it zooms smoothly and divides neatly into reusable tiles.
The correction: no flat world map is perfectly accurate. The problem is using Mercator to answer an area question it was never designed to answer.
05 CHOOSE BY PURPOSE
What should your map tell the truth about?
Pick the property that matters most. There is no universal winner—only a projection that fits the question.
RECOMMENDED
Equal Earth
Use an equal-area projection when comparing countries, climate zones, population, habitat, or any quantity tied to land area.
Area stays honest →06 READ THE MAP, NOT THE MYTH