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
Admiralty Arch, Holyhead Admiralty Arch, Holyhead Admiralty Arch, located in Holyhead, Anglesey, was built in 1824 to mark the end of Thomas Telford's A5 road. The arch was designed by Thomas Harrison and its main purpose was to commemorate the visit of King George IV of the United Kingdom in 1821, when he set sail from Holyhead on the royal yacht, on a state visit to Ireland. At the London end of the A5, stands the similar and larger Marble Arch. Funded through public subscription the structure took two years to complete and was made of stone quarried at Red Wharf Bay on