The Retuertas horse, Spanish: Caballo de las Retuertas or Caballo de las Retuertas de Doñana, is a rare breed of horse indigenous to the Andalusia region of Spain. It is said to closely resemble the ancient Iberian horses that populated Spain before being domesticated. It is now found only in the Doñana National Park in the provinces of Huelva and Sevilla, and in The Biological Reserve "Campanarios de Azaba" in Espeja (Salamanca province) a part of which is the research reserve of the Consejo Superior de Investigaciones Científicas, the Spanish National Research Council. According to a genetic study by the CSIC, the Retuertas horse is one of the oldest European breeds., dating to 3000 years BP, and the only one living in the wild and isolated from other populations.