
Borku (Borkou) or Borgu (Borgou) is a region of Central Africa, mostly in Northern Chad, forming part of the transitional zone between the arid wastes of the Sahara and the fertile lands of the central Sudan. It is bounded N. by the Tibesti Mountains, and is in great measure occupied by lesser elevations belonging to the same system. These hills t...
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http://en.wikipedia.org/wiki/Borkou

region in northern Chad, centred around the town of Faya (formerly Largeau). It is mostly a sandy desert of the southeastern Sahara, south of the ...
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http://www.britannica.com/eb/a-z/b/95
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