The Standedge Tunnels (Standedge is normally pronounced Stannige) are four parallel tunnels that run beneath the Pennines at the traditional Standedge crossing point between Marsden and Diggle, on the edges of the conurbations of West Yorkshire and Greater Manchester respectively, in northern England. There are three railway tunnels and a canal tunnel. The canal tunnel is the longest and oldest of the tunnels, and holds the record as the longest and highest canal tunnel in Britain.