The honesty band: where Mercator tells the truth
On the equator Mercator adds almost no distortion — within about 15° of the line the area error never tops ~14%, so these countries are drawn nearly true to size.
By W. Viljoen · Published 21 June 2026
Ecuador,
Colombia,
Brazil,
São Tomé and Príncipe,
Gabon,
Republic of the Congo,
Democratic Republic of the Congo,
Uganda,
Kenya,
Somalia,
IndonesiaThe one line the map gets right
Every story about Mercator is usually about how much it exaggerates — Greenland,
Russia, Canada, the bloated north. But the same maths that inflates the poles leaves
one band almost untouched: the equator. The countries highlighted here sit on or
beside the line, and the map draws them at very nearly their true size.
Why the equator is honest
Mercator stretches every shape by a factor of sec²(latitude) in area. At the
poles that blows up toward infinity; at the equator sec²(0°) = 1, so there is no
inflation at all. Stay within about 15° of the line and the area error never tops
roughly 14% — small enough that these countries look, for once, the size they
actually are. The further north or south you go, the more the map starts to lie.
The countries on the line
Going around the world, the equator crosses land in:
- The Americas: Ecuador, Colombia, Brazil
- Africa: São Tomé and Príncipe, Gabon, Republic of the Congo, DR Congo,
Uganda, Kenya, Somalia
- Asia: Indonesia — across Sumatra, Borneo and Sulawesi
- The Pacific: Kiribati, whose atolls straddle the line far out to sea
(The Maldives sit just off the line, in the equatorial sea.) The highlighted set
on the map is the continental sweep of the band; Kiribati's scattered atolls are
left out only because they wrap the date line.
Try it
Look at how modestly these countries are drawn — that restraint is the point. Now
picture Greenland or Russia up at the top of the same map, blown up many times over.
Same projection, opposite treatment: the equator is where Mercator finally tells the
truth.
Explore Ecuador, Colombia, Brazil, São Tomé and Príncipe, Gabon, Republic of the Congo, Democratic Republic of the Congo, Uganda, Kenya, Somalia, and Indonesia on the full-screen map→Next in Where Mercator Lies LeastIndonesia, to scale: the giant the map draws honestly→