Montmajour Abbey, formally the Abbey of St. Peter in Montmajour (French: Abbaye Saint-Pierre de Montmajour), was a fortified Benedictine monastery built between the 10th and 18th centuries on what was originally an island five kilometers north of Arles, in what is now the Bouches-du-Rhône Department, in the region of Provence in the south of France. The abbey complex consists of six sections: It has been listed since 1840 as a monument historique by the French Ministry of Culture. Today the ruins of the abbey are cared for as a historic monument by the Centre des monuments nationaux.