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Why Greenland Looks Huge on Maps

On a typical world map — the Mercator projection used in classrooms and on Google Maps — Greenland looks about the same size as Africa. In reality Africa is 14 times the size of Greenland. The reason is mathematical: Mercator's area scale at latitude φ is sec²(φ), which means areas at 70° N are inflated by a factor of nearly 10. This article explains the math accessibly, surveys the other countries Mercator visually distorts (Russia, Canada, Antarctica, Alaska), and points toward equal-area alternatives.

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The Greenland-versus-Africa illusion is one of the best-known cartographic optical effects. It is also a great entry point into the broader question of why every flat map of a curved Earth has to lie about something — covered in the /learn/what-is-a-map-projection pillar. This article focuses specifically on the visual phenomenon that most people first encounter as “wait, is Greenland really that big?”, walks through the math, gives examples for many other countries, and points toward better projection choices when area matters.

The famous illusion

A side-by-side comparison of Africa and Greenland tells the story:

| Region | True area (million km²) | Mercator-displayed area at 71° N | Apparent ratio on Mercator | |---|---|---|---| | Africa | 30.37 | ~32 (modestly distorted) | "Looks similar to Greenland" | | Greenland | 2.166 | ~20 (inflated by ~9.5×) | (above) |

On Mercator, Greenland appears almost as large as Africa. In reality, Africa is 14 times larger than Greenland. The visual deception is not subtle — it is the largest area-distortion mismatch most viewers ever encounter, and a classroom Mercator hanging on a wall for a decade teaches a generation of students an entirely wrong intuition about the relative sizes of countries.

The same illusion creates other classic mismatches:

  • Greenland looks larger than Australia. Australia is 7.692 million km², about 3.5 times the size of Greenland. On Mercator they look similar.
  • Russia looks larger than Africa. Russia is 17.10 million km², roughly half the size of Africa. On Mercator they look similar.
  • Canada looks larger than Africa. Canada is 9.985 million km², roughly a third of Africa. On Mercator they look similar.
  • Antarctica looks like a giant band across the bottom of the map. Antarctica is 14.0 million km², roughly half of Africa. On Mercator (when shown — it is often clipped) it appears to span the whole bottom of the world.

In every case the high-latitude landmass appears far larger than its true size, and the equatorial landmass looks roughly correct.

The math behind the inflation

Gerardus Mercator's 1569 projection is conformal: it preserves angles at every point, which makes it useful for navigation but forces it to distort area. The area scale factor at latitude φ on Mercator is

area scale = sec²(φ) = 1 / cos²(φ)

Concretely:

| Latitude | sec²(φ) | What this means | |---|---|---| | 0° (equator) | 1.00 | True size | | 15° | 1.07 | 7% inflated | | 30° | 1.33 | 33% inflated | | 45° | 2.00 | Double area | | 60° | 4.00 | Quadruple area | | 70° | 8.55 | 8.5× inflated | | 71° (centre of Greenland) | 9.46 | 9.5× inflated | | 75° | 14.93 | 15× inflated | | 80° | 33.16 | 33× inflated | | 85° | 131.6 | 131× inflated | | 90° | ∞ | Infinite inflation at the pole |

The function blows up at the poles, which is why Mercator projections are typically clipped above 85° or so. The full map would have infinite vertical extent.

Most of the visible inflation is in the polar regions. At 30° (Cairo, New Orleans, Shanghai roughly), the inflation is only about 33% — visible but mild. At 60° (Stockholm, Anchorage, Helsinki) it is already quadruple. The bulk of Greenland (above 60° N) is therefore shown at 4× to 33× its true area.

Country-by-country: what looks wrong

A more complete picture of which countries are visually distorted on Mercator:

Severely inflated (looks larger than reality):

  • Greenland (centroid ~71°N, inflation ~9.5×)
  • Antarctica (mostly below ~80°S, inflation ~33×)
  • Iceland (centroid ~65°N, inflation ~5.5×)
  • Russia (most of population at 55–60°N, large area at 60–70°N)
  • Canada (most of area at 50–70°N)
  • Norway (most of population at 60°N, north reaching 71°N)
  • Sweden, Finland (similar to Norway)
  • Alaska (centred at ~64°N)

Modestly inflated:

  • United States contiguous 48 (centroid ~37°N, inflation ~1.6×)
  • China (centroid ~33°N, inflation ~1.4×)
  • Europe (centroid ~50°N, inflation ~2.4×)
  • Argentina (centroid ~38°S, inflation ~1.6×)
  • Australia (centroid ~25°S, inflation ~1.2×)

Roughly true size:

  • Indonesia (straddles equator)
  • Brazil (centroid ~10°S, inflation ~1.03×)
  • Central African nations (Gabon, the Congos, Kenya — all near-equatorial)
  • India (centroid ~22°N, inflation ~1.16×)
  • Mexico (centroid ~24°N, inflation ~1.20×)

Equatorial countries are essentially their true size; mid-latitude countries are noticeably inflated; high-latitude countries are dramatically inflated.

Why Mercator is still everywhere

If Mercator distorts area so badly, why is it still the default in classrooms, on Google Maps, on Apple Maps, on virtually every web map you see? Two reasons:

Navigation. A straight line drawn on Mercator is a constant-bearing course (a rhumb line) on Earth. A sailor following a fixed compass heading traces out a straight line on Mercator. For more than four centuries this property made Mercator the indispensable projection for marine charts. The /learn/mercator-projection support covers the reasoning in depth.

Tile-pyramid efficiency. Web maps use a tile-based system: the world is divided into rectangular tiles at multiple zoom levels. Web Mercator, a slight variant of classical Mercator, has the property that each tile zoom level subdivides into exactly four tiles at the next zoom level. The math is clean, the tiles cache well, and the implementation is simple. The /learn/web-mercator-projection support covers the standard (EPSG:3857) that powers most consumer web maps.

The area distortion is a known cost. Cartographers have long argued that thematic maps showing area-derived quantities should not use Mercator, but the operational benefits keep the projection in universal use for navigation and zoom-and-pan web mapping.

Africa is bigger than you think

A useful corollary to the Greenland illusion: most people from the Mercator-using world systematically underestimate Africa's size. Kai Krause's 2010 infographic “The True Size of Africa” made the point vividly by showing that Africa is large enough to contain — simultaneously and in their true sizes — the United States, China, India, Japan, the British Isles, the major Western European countries, and substantial fractions of Eastern Europe, with room to spare. The infographic went viral and is now a standard teaching aid.

The arithmetic is straightforward:

| Region | Area (M km²) | Cumulative | |---|---|---| | United States | 9.83 | 9.83 | | China | 9.60 | 19.43 | | India | 3.29 | 22.72 | | Japan | 0.38 | 23.10 | | All Europe minus Russia | 6.0 | 29.10 | | Total of the above | 29.10 | — | | Africa | 30.37 | (Africa is larger) |

Africa is larger than all of those territories combined. On Mercator maps, this is invisible — Africa shrinks toward the equator while the others inflate. The Krause infographic uses an equal-area projection internally so the visual size is the true relative size.

Mental maps and Mercator

Decades of Mercator exposure have measurable effects on people's mental geography. Studies in cognitive psychology and geography education have shown that students raised on Mercator maps overestimate the size of high-latitude countries and underestimate the size of equatorial countries when asked to draw, compare, or rank country sizes from memory. The effect is consistent across samples and weakly resistant to correction by isolated equal-area exposure; the visual repetition of Mercator across one's school years biases the intuition.

Equal-area projection adoption in school curricula has been controversial partly because of this inertia. The Boston Public Schools 2017 switch to Gall-Peters was motivated partly by the mental-map argument: a generation of students raised on equal-area maps would have less skewed intuitions about country sizes. Whether the switch achieves that goal — and whether it justifies the loss of shape recognition that Peters introduces — is the live debate covered in the /learn/peters-projection support.

What to use instead — for size comparison

If your map is supposed to communicate accurate country sizes, use an equal-area projection covered in the /learn/equal-area-projections support. The main options:

  • Equal Earth (2018) — modern, designed for visual balance plus exact area preservation.
  • Mollweide (1805) — classic elliptical world map; equal-area; good shape preservation for ~most of the inhabited world.
  • Eckert IV (1906) — pseudocylindrical equal-area, common in geography textbooks.
  • Gall-Peters (1855/1973) — the famous “equal-area” alternative to Mercator; see Peters.

For interactive size comparison, the website thetruesize.com lets you drag countries around the Mercator map and watch them shrink as they approach the equator. The exercise is unforgettable: drag Greenland down to the equator and it visibly collapses to one-tenth its Mercator size, ending up as a small island in the Gulf of Guinea rather than the seeming continent-sized landmass it had appeared to be at its native latitude.

What to use instead — for visual reference

If your map is for general-purpose visual reference (not navigation, not thematic data), a compromise projection is often the right choice:

  • Winkel Tripel — National Geographic's standard since 1998.
  • Robinson — National Geographic's standard 1988–1998; still widely used.
  • Natural Earth II — Tom Patterson's 2007 visual-balance projection.

These compromise projections distribute the inevitable distortion across area, shape, and direction in roughly equal measure. Greenland on Winkel Tripel looks about 3× its true area — substantially better than Mercator's 9.5× — while still showing landmass shapes recognisably.

For digital map products that allow users to switch projections at runtime, the recent norm is to offer Mercator (or Web Mercator) for navigation and zoom-and-pan, plus one or two alternatives (typically Equal Earth or Winkel Tripel) for static thematic display. ArcGIS Online, QGIS, and Mapbox all expose this choice; consumer web maps from Google and Apple still default to Web Mercator without exposing the alternative. The Greenland-vs-Africa illusion is therefore likely to persist as a default visual experience even though better choices exist in the underlying software.

Sources

For closely related topics, see /learn/mercator-projection for the projection that creates the illusion, /learn/equal-area-projections for the family that fixes it, and /learn/web-mercator-projection for why the same problem persists in modern web mapping.

Related

Frequently asked questions

How much bigger is Africa than Greenland really?

About 14 times bigger by area. Africa is 30.37 million km²; Greenland is 2.166 million km². The Mercator projection — the one used in most classroom world maps and on Google Maps — visually inflates Greenland by a factor of nearly 10 because of the way it stretches the high latitudes. The same effect makes Greenland appear roughly equal in size to Africa, when in reality the continent is more than an order of magnitude larger.

Why does Mercator inflate the high latitudes so much?

By mathematical necessity. Mercator is a conformal projection — it preserves angles at every point — and the price of conformality is that area must vary with latitude. Specifically, the area scale at latitude φ on Mercator is sec²(φ): at the equator (φ = 0) the scale is 1, at 60° it is 4, at 70° it is about 8.5, and at 80° it is about 33. Greenland's central latitude is around 71°, so its area on Mercator is inflated by about 9.5 times its true value.

Which other countries are misrepresented?

Anything at high latitudes is inflated; anything near the equator looks roughly correct. The most distorted are Greenland, Iceland, Antarctica, Russia, Canada, Norway, Sweden, Finland, and Alaska. Countries close to the equator — Indonesia, Brazil, parts of central Africa — appear roughly their true relative size on Mercator. The mid-latitudes (USA, China, Australia) are inflated noticeably but not absurdly.

Then why do we keep using Mercator if it lies about sizes?

Because the lie is about *size*, not about *direction*. Mercator preserves angles exactly, which makes it ideal for navigation — a straight line on the map is a constant-bearing course (a rhumb line) on Earth, which sailors and pilots can follow with a single compass heading. Mercator is also computationally efficient at scale: the Web Mercator variant used by Google Maps, Apple Maps, and OpenStreetMap divides into tiles that can be cached, served, and zoomed efficiently. The area distortion is the price for those operational properties.

What should I use instead?

Depends on the purpose. For thematic maps showing area-derived quantities (population density, GDP per area), use an equal-area projection like Equal Earth, Mollweide, or the Eckert IV — these preserve area exactly at the cost of shape. For general-purpose visual reference, use a compromise projection like Robinson or Winkel Tripel. For navigation, keep using Mercator. For comparing country sizes interactively, the website thetruesize.com lets you drag countries around the Mercator map and visually see them shrink to true size as they approach the equator.

Sources

  1. USGS — Snyder, Map Projections — A Working Manual (Prof. Paper 1395) · https://pubs.usgs.gov/pp/1395/report.pdf · Accessed .
  2. CIA World Factbook — Country areas — Greenland, Africa, Russia, Canada, Antarctica · https://www.cia.gov/the-world-factbook/ · Accessed .
  3. USGS — The National Map — projection and accuracy standards · https://www.usgs.gov/programs/national-geospatial-program/national-map · Accessed .
  4. NASA — Earth Observatory — Map Projections: The Good, the Bad, and the Ugly · https://earthobservatory.nasa.gov/blogs/elegantfigures/2013/06/03/map-projections-the-good-the-bad-and-the-ugly/ · Accessed .
  5. The True Size of — thetruesize.com — interactive country-size comparison · https://thetruesize.com/ · Accessed .

Cite this article

APA format:

Steve K. (2026). Why Greenland Looks Huge on Maps. Coordinately. https://coordinately.org/learn/why-greenland-looks-huge-on-maps

BibTeX:

@misc{coordinately_whygreenlandlooks_2026,
  author = {K., Steve},
  title  = {Why Greenland Looks Huge on Maps},
  year   = {2026},
  publisher = {Coordinately},
  url    = {https://coordinately.org/learn/why-greenland-looks-huge-on-maps},
  note   = {Accessed: 2026-06-05}
}