Anglesey the island. The highest six are Holyhead Mountain, ; Mynydd Bodafon, ; Mynydd Llaneilian, ; Mynydd y Garn, ; Bwrdd Arthur, ; and Mynydd Llwydiarth, . To the south and south-east the island is separated from the Welsh mainland by the Menai Strait, which at its narrowest point is about wide. In all other directions the island is surrounded by the Irish Sea. It is the 51st largest island in Europe, and just five square kilometres smaller than Singapore. There are several small towns scattered around the island, making it quite evenly populated. The largest are Holyhead, Llangefni, Benllech, Menai
Salt Island, Anglesey island was the Stanley Sailor's Hospital. This hospital was set up in 1871 by a local philanthropist and initially only treated sailors although it quickly became a general hospital. It was taken over by the National Health Service in 1948 and closed its doors in 1987. There have been three lighthouses located on the island. The current lighthouse is the Holyhead Mail Pier Light. It was designed by John Rennie the Elder in 1821, although he died before supervising the construction. It is one of the few surviving examples of Rennie's work. The lighthouse was superseded by the Holyhead Breakwater