St Michael's Mount a tidal island off the Mount's Bay coast of Cornwall. A civil parish, united with the town of Marazion by a man-made causeway of granite setts, passable between mid-tide & low water. In 1954, the 3rd Baron St Levan gave most of St Michael's Mount to the National Trust. The St Aubyn family retained a 999-year lease to inhabit the castle & a licence to manage the public viewing of its historic rooms in conjunction with the National Trust.
Mont Saint-Miche is a rocky tidal island and a commune in Normandy, France. It is located approximately one kilometre off the country's north-western coast, at the mouth of the Couesnon River near Avranches. The island has been a strategic point holding fortifications since ancient times, and since the 8th century AD it became the seat of the Saint-Michel monastery, from which it draws the name. The Mont-Saint-Michel and its bay are part of the UNESCO list of World Heritage Sites.