Why Does Greenland Look So Big? Map Projections and the Trade-Offs Behind Every World Map
Greenland looks huge on many world maps because projections trade accurate area for other useful properties. Learn how Mercator, equal-area, and compromise maps serve different purposes.
Greenland looks enormous on many familiar world maps because the map projection stretches places near the poles. Greenland is not nearly the size of Africa: Africa is about fourteen times larger. The surprise is not that the map is “wrong.” It is that every flat world map must change some combination of area, shape, distance, or direction when it turns Earth’s curved surface into a rectangle or another flat shape.
A projection is therefore a set of choices. A map designed to keep compass bearings useful for navigation will not show the relative sizes of countries as accurately as an equal-area map. A map that preserves area may make familiar coastlines look stretched. The right question is not “Which map is perfect?” but “Which projection fits the job?”
The Greenland–Africa puzzle
On a Mercator world map, Greenland can appear close to Africa in size. On a globe, the contrast is unmistakable. Greenland sits at high northern latitudes, where Mercator’s scale increases sharply; Africa straddles the equator, where distortion is much smaller. The result is a powerful visual illusion about relative area.
National Geographic Education’s projection guide confirms that Africa is about fourteen times larger than Greenland. This comparison is useful because it exposes a common assumption: readers often treat the amount of space a place occupies on a page as if it were its true land area. That is safe only when the map’s projection preserves area.
Why a round world cannot become a flat map without distortion
Imagine peeling an orange and trying to press the curved peel into a perfect rectangle. It must tear, overlap, stretch, or leave gaps. A cartographer faces a mathematical version of the same problem. Latitude and longitude locate points on a curved surface, while a printed or digital map places those points on a flat grid.
The U.S. Geological Survey explains that this transformation cannot be completed without distortion and that there is no single “best” projection. A projection may prioritize one or more of these properties:
- Area: whether regions appear in their correct relative sizes.
- Shape and angles: whether small features keep their local form and intersecting lines keep their angles.
- Distance: whether selected distances can be measured accurately.
- Direction: whether a bearing from one place to another is represented correctly.
No flat world map preserves all four properties everywhere. Distortion also varies by location. A projection may work well near the equator, along a chosen line, or around a central point while changing more dramatically elsewhere.
Three useful projection choices
Mercator: useful angles, misleading world-area comparisons
Gerardus Mercator presented his projection in 1569. It is a conformal projection, meaning that it preserves local angles and shapes at a very small scale. On the traditional Mercator projection, a line following a constant compass bearing appears straight, which made the design valuable for marine navigation.
The trade-off is area. Lines of latitude spread farther apart toward the poles, so high-latitude places expand on the page. Greenland, northern Canada, Alaska, Russia, and Antarctica therefore look much larger relative to equatorial regions than they are. The poles themselves cannot be shown on a complete Mercator map because the scale increases without limit as the map approaches them. The ArcGIS Pro documentation for Mercator describes these properties and cautions against using it for general world maps or thematic maps that depend on area.
A related form called Web Mercator is widely used for interactive online basemaps. That does not make it a good tool for comparing continent sizes. It is popular because map tiles align consistently and local views are practical when users zoom and pan.
Equal-area projections: honest relative size, altered shapes
An equal-area projection keeps the relative area of mapped regions correct. If one country covers twice the land area of another on Earth, it also covers twice the map area. This makes equal-area maps strong choices for world patterns in which the amount of space matters, such as forest cover, population totals by region, habitat range, or the geographic extent of a phenomenon.
That accuracy comes with another trade-off: shapes, angles, directions, or distances must change. On an Equal Earth map, for example, Greenland and Africa regain their correct area relationship, but some landforms look wider, narrower, or more curved than they do on a globe. ArcGIS Pro’s Equal Earth reference identifies it as an equal-area projection intended especially for thematic world maps and analysis requiring accurate areas.
Compromise projections: a balanced general view
A compromise projection does not preserve one property perfectly. Instead, it tries to reduce several kinds of distortion so the whole world has a balanced, readable appearance. Robinson and Winkel Tripel are well-known examples.
Winkel Tripel still distorts area, shape, distance, direction, and angles, but it keeps the overall distortions comparatively moderate. That makes it useful for a general world map or classroom wall map where readers need a recognizable overview rather than exact area measurement or a navigation route. The Winkel Tripel projection reference explains that it is neither conformal nor equal-area and is intended for general world maps.
| Projection approach | What it prioritizes | Useful for | Main caution |
|---|---|---|---|
| Mercator | Local angles and small-scale shapes | Traditional marine navigation and some local mapping | Greatly enlarges high-latitude areas on a world map |
| Equal-area, such as Equal Earth | Correct relative area | Comparing the extent of global patterns | Changes shapes, angles, distances, or directions |
| Compromise, such as Winkel Tripel | A visual balance among distortions | General-reference and classroom world maps | Does not preserve any major property everywhere |
How a projection can change the story a map tells
Projection choice is not decoration. It can affect the comparison a reader notices first and the conclusion that seems natural.
Navigation
A navigator may value consistent bearings more than accurate continent areas. Mercator was designed around that purpose. Judging it only as a classroom world map ignores the problem it was built to solve.
Climate, population, and environmental patterns
If a map uses colour to show the extent of sea ice, forest loss, drought, or habitat, exaggerated land areas can give high-latitude regions too much visual weight. An equal-area projection is often a better starting point when the purpose is to compare how much of Earth’s surface a pattern covers. The legend, classification method, scale, and data source still matter too; a suitable projection cannot rescue poor data or misleading categories.
General world maps
A classroom map must support many tasks at once: locating countries, noticing oceans, comparing regions, and understanding global position. A compromise projection can reduce the most distracting distortions without pretending to eliminate them. A globe remains the clearest reference for the planet’s overall geometry.
Try a projection-choice investigation
You do not need advanced software to investigate map projections. Find three reputable world maps that name their projections—one Mercator or Web Mercator view, one equal-area map, and one compromise map. Then use the same questions for each map:
- Compare Greenland with Africa, South America, and Australia. Which size relationships change?
- Look at the spacing of latitude lines. What happens as they approach the poles?
- Inspect the shapes of Africa, Antarctica, and regions near the map’s outer edges. Where is stretching easiest to see?
- Read the map’s stated purpose. Does its projection protect the property that matters most for that purpose?
- Choose one task—plotting a sea route, comparing forest area, or displaying a classroom overview—and defend the best projection for it.
Students in Grades 5–7 can record observations in a three-column chart and explain one choice aloud or in writing. Students in Grades 8–12 can distinguish area, angular, distance, and directional distortion, then evaluate how projection choice could influence interpretation of a thematic map.
A four-question map check
Before trusting the picture a world map creates, ask:
- What projection is this? Look in the legend, credits, metadata, or source notes.
- What is the map trying to help me do? Navigation, area comparison, route planning, and general reference require different strengths.
- What does this projection preserve? Identify whether area, local angles, selected distances, or selected directions receive priority.
- Where is distortion likely to be strongest? Check the poles, edges, and places far from the projection’s central lines or point.
If the projection is not named, do not guess from appearance alone. Treat the map as a visual source with missing context and look for a better-documented version.
How parents and educators can make the idea concrete
Begin with the Greenland–Africa question before introducing vocabulary. Ask students which place appears larger, then let them check a globe or an equal-area map. The contradiction creates a genuine reason to learn what a projection does.
Avoid framing the lesson as “this map lies.” Maps are models built for purposes. A better prompt is: “What does this map help us see accurately, and what does it make harder to compare?” That question transfers to graphs, diagrams, timelines, and data visualizations as well.
When assigning a map-based project, require students to name the projection or mapping source and add one sentence about its suitability. For older students, make projection choice part of the evidence: an area-based claim should not rest uncritically on a projection that inflates polar regions.
Related IQGradeUp reading
- Use Don’t Skip the Diagram: A 5-Step Way to Read Visual Information in Textbooks to check legends, scales, symbols, and visual patterns before interpreting a map.
- Explore the physical routes behind digital connections in The Secret Geography of the Internet: How Cables and Satellites Connect the World.
- Connect maps to Earth-observation data with How Satellites and Space Data Quietly Run the World Beneath Our Feet.
Final takeaway
Greenland looks so big on many maps because Mercator-style projections stretch high latitudes. That distortion is not a random mistake; it is the cost of preserving other useful properties. Equal-area maps protect relative size, compromise maps balance several distortions, and Mercator serves particular navigation and local-mapping purposes. Read a world map as a designed model: identify its projection, match it to its purpose, and check the trade-offs before drawing conclusions.