Corcomroe Abbey (Irish: Mainistir Chorca Mrua) is an early 13th-century Cistercian monastery located in the north of the Burren region of County Clare, Ireland, a few miles east of the village of Ballyvaughan in the Barony of Burren. It was once known as "St. Mary of the Fertile Rock", a reference to the Burren's fertile soil. The Romanesque ruins feature stone carvings that are considered to be among the finest in a Cistercian church in Ireland. The abbey appears in W.B. Yeats' play The Dreaming of Bones. They constitute a National Monument and are open to the public.