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Cei Ballast is the man-made island in front of Harbour Station. It is home to a number of wildlife species. (There may have been a sand bank there previously, but the size today is purely man-made)
In older maps it is marked as Lewis's Island after a man by the name of Lewis who lived on the island and operated a steam crane to unload ships. 
Cei Ballast is one of 43 (unbridged) tidal islands which can be walked to from the mainland of Great Britain at low tide.