Anglesey is an island situated on the north coast of Wales with an area of 276 square miles . Anglesey is by far the largest island in Wales and the seventh largest in the British Isles. Anglesey is also the largest island in the Irish Sea by area, and the second most populous island . The ferry port of Holyhead handles more than 2 million passengers each year. The Menai Suspension Bridge, designed by Thomas Telford in 1826, and the Britannia Bridge span the Menai Strait to connect Anglesey with the mainland.