The map on the left looks unexceptional to me, a layman. It’s a standard, if rather archaic, map of West Africa.
But geographers are a lot sharper than most of us, with the kind of keen eye that can spot a child trying to pick up something very unpleasant on a wet beach at a distance of 100 yards. Through drizzle.
And those geographers would probably be able to tell you that the mountain range that runs along the north border of Upper Guinea doesn’t actually exist. It never has.
You see, this map was created by the cartographer James Rennell to accompany the Scottish explorer Mungo Park’s travelogue, Travels in the Interior Districts of Africa (1798). Park was trying to find the source of the Niger river and was curious as to why it didn’t flow south of the Gulf of New Guinea. He…
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