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
Anglesey and Newborough. Almost the entire coastline of Anglesey is designated as an Area of Outstanding Natural Beauty (AONB) to protect the aesthetic appeal and variety of the island's coastal landscape and habitats from inappropriate development. The coastal zone of Anglesey was designated as an AONB in 1966 and was confirmed as such in 1967. The AONB is predominantly a coastal designation, covering most of Anglesey's coastline but also encompasses Holyhead Mountain and Mynydd Bodafon. Substantial areas of other land protected by the AONB form the backdrop to the coast. The AONB is about 221 km (85 sq mi) and it