This island sanctuary at the border between Normandy and Brittany is truly a merveille de l'Occident ' a Wonder of the Western World. 
An ancient chapel is built on the island sanctuary. 
mnli hypothesis: An ancient chapel is built on the island sanctuary.  premise: This island sanctuary at the border between Normandy and Brittany is truly a merveille de l'Occident ' a Wonder of the Western World. 