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Camel caravan in the Sahara of Mauritania. Introduced here around AD 100, camels rapidly replaced horses and oxen as the climate became drier in the following centuries. (Photo: S. Leroy) Remains of the 13 th century city of Chinguetti, in the Mauritanian Sahara, the seventh holiest city in Islam and a World Heritage Site since 1996. It was created as a stop-over for the caravan trade( mainly salt), and was built on the site of the 7 th century town of Abbere that had disappeared beneath bedoi:10.18814/epiiugs/2003/v26i2/007 fatcat:yn4uywy4ljdb5n6uzheph6xvem