Normandy, Isles of Scilly  Normandy is a small settlement on the island of St Mary's, the largest of the Isles of Scilly, England. It is located in the east of the island, between Pelistry (to the north) and Porth Hellick (to the south) on the A3110 road. The Isles of Scilly's only public swimming pool is located here; it is covered. The settlement is otherwise largely residential, with houses and apartments lived in by permanent residents of the island. Close by is the island's main desalination works, which draws water in from the sea and purifies it for the public fresh water system.