In a deliberately provocative speech, David Cameron, the Tory leader, adopted the metaphor of a caravan crossing the desert to highlight the importance of making sure that the income growth of the poorest keeps pace with the rest.

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Belmokhtar and Zeid mastered the contours of this desert, memorizing its sand-swept ancient caravan routes, and pitching their holy war to villagers.

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Using a fleet of automobiles supported by a camel caravan, he would lead an expedition to the Gobi desert in an attempt to reconstruct the entire natural history of the Central Asian plateau.

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The safari, included with the room rate, started as a caravan of Land Rovers carrying about 15 hotel guests into the Great Sand Sea, a vast swath of desert that dominates northeastern Africa.

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