The Pyrenees (/ˈpɪrɨniːz/; Spanish: Pirineos or Pirineo, French: Pyrénées, Aragonese: Perinés, Catalan: Pirineus, Occitan: Pirenèus, Basque: Pirinioak or Auñamendiak) is a range of mountains in southwest Europe that forms a natural border between France and Spain.