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The Pyrénées are a mountain range of the Southwest of Europe. They extend in length according to an East-west direction over a rough distance of 430 kilometers since the Mediterranean Sea to the Bay of Biscay, Atlantic ocean. The chain of Pyrénées crosses three regions and six French departments, from east to west : ■ Languedoc-Roussillon (Pyrénées-OrientalesAude), ■ Midi-Pyrénées (AriègeHaute-Garonne, Hautes-Pyrénées), ■ Aquitaine (Pyrénées-Atlantiques).