Before you read on, make a quick call on each of these pairs. More than 1,000km, or less?
- Brisbane to Melbourne
- Los Angeles to Mexico City
- London to Moscow
- New York to Miami
Don't Google it. Just guess.
The Answers
- Brisbane to Melbourne: ~1,375 km — more
- Los Angeles to Mexico City: ~2,500 km — much more
- London to Moscow: ~2,500 km — more
- New York to Miami: ~2,040 km — more
All four are over 1,000km. Some by a significant margin.
If you said "less" for any of them — and a lot of people do — you're encountering one of the more consistent biases in how humans perceive geography.
Why Our Mental Maps Are Wrong
Two things distort geographic perception in predictable ways.
The first is political borders. When two cities are in the same country, we unconsciously assume they're closer than they are. When they're in different countries, we expect them to be far apart. But borders are political constructs, not geographic ones. Australia is a continent-sized country; the distance from Brisbane to Melbourne being over 1,000km should make sense, but it doesn't feel that way on a mental map. Meanwhile, Los Angeles and Mexico City are in different countries, but the border is only a few hundred kilometres from LA — Mexico City is much further south than most people picture it.
The second is map projection. Almost every map you've encountered uses a version of the Mercator projection, which was designed in 1569 for maritime navigation. It preserves angles — useful for plotting compass bearings — but dramatically distorts area and apparent distance as you move toward the poles. On a Mercator map, Greenland appears roughly the same size as Africa; in reality, Africa is about 14 times larger. Northern Europe looks vast; Southeast Asia looks compact. We've been looking at this distortion our entire lives and internalised it as reality.
I find that players tend to underestimate distances within continents they know well — their mental map of familiar territory is more detailed but still scaled down — and overestimate distances in regions they've never travelled to, where the mental map is just a vague sketch.
1,000km as a Reference Point
1,000km is a useful anchor precisely because it's large enough to be counterintuitive. It's roughly the driving distance from London to Edinburgh and back. It's the width of Germany at its widest. It's roughly the coastal driving distance from Melbourne to Adelaide.
Once you have a felt sense of what 1,000km means, other distances start clicking into place. Europe becomes surprisingly compact — Paris, Amsterdam, Berlin, and Prague all sit within about 1,000km of each other. Russia and Canada become genuinely vast in a way that flat maps don't communicate. The Pacific Ocean becomes something you can start to appreciate in scale terms.
Distance Intuition as a Trainable Skill
This is the idea behind GlobeHoppr: rather than testing capital city facts or country names, it builds your sense of distance by making distance the mechanic.
You start in one city, you need to reach a destination, and each move can only cover a limited range. Every decision becomes a judgment call: what cities are within reach from here? Over time, those repeated judgments build a spatial model that your map-gazing hasn't. You start to feel why crossing the Pacific is a fundamentally different problem from crossing the Atlantic. You develop intuitions about which city pairs are actually close — and which only look close on a misleading map.
The Connection to Magnitudle
Both Magnitudle and GlobeHoppr are built on the same underlying challenge: our intuitions about quantities and distances are systematically miscalibrated in predictable ways. Geographic distance and numerical magnitude both resist intuition because neither maps cleanly onto anything in everyday human experience.
The Brisbane-to-Melbourne question trips people up for the same reason that "how many chickens are alive on Earth?" trips people up. Both activate vague feelings — "big country" or "big number" — without producing a specific, accurate estimate. Training either skill means building better anchors: reference points you can reason from rather than feelings you can only guess with.
For more on why numerical quantities follow the same pattern, see What Is an Estimation Game?