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Encompassing about 3.5 million sq mi (9 million sq km) of Northern Africa, the Sahara is the largest desert in the world. Nevertheless, humans have maintained trade routes through it for millennia, linking the Mediterranean Sea in the north to various regions in Africa. In its heyday, after the introduction of the camel in the 1st century CE, trans-Saharan trade was principally carried out by Berber-speaking nomads. What mineral still mined today was a major Saharan trade good in ancient times?
Source: The Free Dictionary