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
Holyhead Breakwater Lighthouse approaching Holyhead in the fog would be warned by a bell operated from the lighthouse. In the late 1870s, this was supplemented with rockets which would complement the gun fired from the fog warning station on North Stack, Anglesey. The lighthouse was manned until November 1961, when it was automated. Among the last keepers in the 1950s were Arthur Burgess and David John Williams. The latter later became a speaker for Trinity House giving talks on the service. Like most other lights in Gwynedd, it is now operated from Trinity House's Holyhead Control Centre. Today the upkeep of the lighthouse