Known since Roman antiquity, the sparkling natural mineral waters of Orezza arise in the heart of the majestic Castagniccia. Authorised by ministerial decree on April 25, 1856, this thermal water, remarkable for its high iron content, was used to treat anaemia, disorders of the nervous system, malaria, and liver and kidney diseases. Now only used for drinking, the water of Orezza is part of the common heritage of all Corsicans.