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Anglesey is an island off the north-west coast of Wales. It forms the bulk of the county known as the Isle of Anglesey, which also includes Holy Island and some islets and skerries. The county borders Gwynedd across the Menai Strait to the southeast, and is otherwise surrounded by the Irish Sea. Holyhead is the largest town, and the administrative centre is Llangefni. The county is part of the preserved county of Gwynedd. The Isle of Anglesey is sparsely populated, with an area of 275 square miles (712 km⁲) and a population of 69,049 in 2022. After Holyhead (12,103), the largest settlements are Llangefni (5,500) and Amlwch (3,967). The economy of the county is mostly based on agriculture, energy, and tourism, the latter especially on the coast. Holyhead is also a major ferry port for Dublin, Ireland. The county has the second-highest percentage of Welsh speakers in Wales, at 57.2%, and is considered a heartland of the language. The island of Anglesey, at 261 square miles (676 km⁲), is the largest in Wales and the Irish Sea, the seventh largest in Britain, and the sixth most populous island in Britain. The northern and eastern coasts of the island are rugged, and the southern and western coasts are generally gentler; the interior is gently undulating. In the north of the island is Llyn Alaw, a reservoir with an area of 1.4 square miles (4 km⁲). Holy Island has a similar landscape, with a rugged north and west coast and beaches to the east and south. The county is surrounded by smaller islands; several, including South Stack and Puffin Island, are home to seabird colonies. Large parts of the county's coastline have been designated an Area of Outstanding Natural Beauty. The county has many prehistoric monuments, such as Bryn Celli Ddu burial chamber. In the Middle Ages the area was part of the Kingdom of Gwynedd and native Principality of Wales, and the ruling House of Aberffraw maintained courts at Aberffraw and Rhosyr. After Edward I's conquest of Gwynedd he built the castle at Beaumaris, which forms part of the Castles and Town Walls of King Edward in Gwynedd World Heritage Site. The Menai Strait to the mainland is spanned by the Menai Suspension Bridge, designed by Thomas Telford in 1826, and the Britannia Bridge, originally designed by Robert Stephenson in 1850.