How a desert trading town on the edge of the Sahara helped move a continent's wealth, one camel caravan at a time.
On the northern rim of the Sahara stood Sijilmasa, a walled city that grew rich on nothing more than being in the right place. It was the northern gateway of the trans-Saharan trade: the point where caravans of thousands of camels set out south across the sand and returned, months later, carrying gold.
The trade ran on a paradox. In the forests of West Africa, gold was plentiful and salt was scarce; in the desert the reverse was true. So merchants carried slabs of Saharan salt south to the goldfields of the Sudan and traded them, at some famous markets weight for weight, for gold dust. A commodity we now take for granted was once, quite literally, worth its weight in the metal that backed the coinage of half the medieval world.
That gold flowed north through Sijilmasa into the mints of Morocco and beyond, into the economies of Europe itself. When the emperor Mansa Musa of Mali crossed the desert on pilgrimage in 1324, he is said to have handed out so much of it in Cairo that the price of gold there slumped for years. Behind that legend lay a working system of wells, guides, credit, and trust, run by families who knew the routes the way sailors know the sea.
Replace with your own research — the excavations at the site, the Arabic geographers who described it, and the questions of how much of the story is trade and how much is myth.