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Photographer Siegfried Modola traveled to document Ethiopia’s ancient salt trade in the Danakil Depression, one of the hottest and harshest environments on earth, with an average annual temperature of 94 degrees Fahrenheit (34.4 Celsius). For centuries, merchants have traveled there with caravans of camels to collect salt from the surface of the vast desert basin. The mineral is extracted and shaped into slabs, then loaded onto the animals before being transported back across the desert so that it can be sold around the country. Read Siegfried’s personal account here.