Anglesey or Ynys Môn (, ) is an island off the north-west coast of Wales. With an area of , Anglesey is by far the largest island of Wales and the fifth-largest island surrounding Great Britain (and the largest outside Scotland). Anglesey is also the largest island in the Irish Sea by area, and the second most populous island in the Irish Sea (after the Isle of Man). The population at the 2011 census was 69,751. Two bridges span the Menai Strait, connecting the island to the mainland: the Menai Suspension Bridge, designed by Thomas Telford in 1826, and the Britannia Bridge.