The Stanley Embankment is a railway, road and cycleway embankment that crosses the Cymyran Strait in Wales, connecting the island of Anglesey and Holy Island. It carries both the North Wales Main Line railway, which runs from Crewe to Holyhead, and the A5 road between London and Holyhead. The embankment was designed by, and its construction overseen by, Thomas Telford and it was named after the Stanley family who were significant benefactors to the area.