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The cork trees, from which cork is harvested, are evergreen trees of the family of oaks and chestnut trees. Only exist in some Mediterranean countries - Portugal, Spain, Italy, France, Morocco, Tunisia and Algeria. The cork oak is the only tree whose bark regenerates itself, acquiring a smoother texture after each extraction. It may be harvested about 17 times over a longevity that is on average 200 years.
It plays such an important role that has been enshrined at the end of 2011, by unanimous vote of Parliament, the National Tree of Portugal.
