The Huddersfield Broad Canal is 4 miles long with 9 wide locks and following the River Colne. It connects the Calder and Hebble Navigation at Cooper Bridge with the Huddersfield Narrow Canal at Aspley Basin in Huddersfield where the Narrow Canal then runs 20 miles further south to the junction with the Ashton Canal in Ashton-under-Lyne. It crosses the Pennines by means of 74 locks and the Standedge Tunnel and provides a connection between the wool-weaving towns of the upper Colne valley such as Golcar, Slaithwaite, and Marsden and over the Pennines to Stalybridge and Manchester. The tunnel at 17,090 feet is the longest canal tunnel in the United Kingdom. After 27 years of restoration the tunnel was fully re-opened to navigation in 2001, when it again became one of three Pennine crossings alongside the Rochdale and the Leeds and Liverpool Canal.