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Caucasia is a broad isthmus between the Black Sea and the Caspian, traversed by a great chain of mountains rising to a height of 18,000 feet. North of the range is a region of interminable plains, known as the Northern Caucasus, or Ciscaucasia, merging imperceptibly into the steppes of the Don and the Volga. Southwards is Transcaucasia, a semi-tropical country intersected by many smaller ranges of mountains