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NORTH-EAST AFRICA.
nearly all the urban populations are concentrated, with the exception of the towns that have sprung up round the mountain strongholds, or places of pilgrimage. The inhabited zone — that is, the voïna-dega, or "wine region," between the degas and
kwallas — lies mainly at a height of from 6,000 to 8,000 feet. At these elevations the mean temperature corresponds to that of the Mediterranean sea-coast, with this difference, that the changes of season are much less noticeable. As the plateaux