Anglesey (Welsh: ynys môn, pronounced (IPA)), is a predominantly Welsh-speaking island and county at the northwestern extremity of Wales. It is separated from the mainland by a narrow stretch of water known as the Menai Strait. It is connected to the mainland by two bridges, the original Menai Suspension Bridge (carrying the A5), built by Thomas Telford in 1826 as a road link, and the newer, twice reconstructed Britannia Bridge (originally the work of Robert Stephenson), which carries the A55 and the North Wales Coast Railway line. The A5025 circles most of its coast. As well as the Isle of Anglesey, the county of Anglesey covers a number of smaller islands, in particular Holy Island. With an area of 275 square miles, Anglesey is the largest Welsh island, and the fifth largest surrounding Britain.