St Michael's Mount is a tidal island in Mount's Bay, Cornwall, United Kingdom. The island is linked to the town of Marazion by a man-made causeway of granite rocks set into a causeway or path that is passable only between mid-tide and low water. It is managed by the National Trust, and the castle and chapel have been the home of the St Aubyn family since approximately 1650.<br /><br />St Michael's Mount is often seen as a Cornish counterpart of Mont-Saint-Michel in Normandy, France (with which it shares the same tidal island characteristics and the same conical shape, though it is much smaller at 57 vs 247 acres)<br /><br />St Michael's Mount is one of 43 unbridged tidal islands that one can walk to from mainland Britain. Part of the island was designated as a Site of Special Scientific Interest in 1995 for its geology.