
The Causses are a group of limestone plateaus (700–1,200 m) in the Massif Central. They are bordered to the north-west by the Limousin and the Périgord uplands, and to the east by the Aubrac and the Cévennes. Large river gorges cut through the plateau, such as the Tarn, Dourbie, Jonte, Lot and Aveyron. Causse is an Occitan word meaning `limes....
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http://en.wikipedia.org/wiki/Causses

gorge-gouged limestone plateaus of southwestern France. The name is from cau, local form of chaux, meaning `lime.` At elevations of from 3,000 to ...
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http://www.britannica.com/eb/a-z/c/39
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