Shropshire Union Canal links are to the Llangollen Canal (at Hurleston Junction), the Middlewich Branch (at Barbridge Junction), which itself connects via the Wardle Canal with the Trent and Mersey Canal, and the River Dee (in Chester). With two connections to the Trent and Mersey (via the Middlewich Branch and the Staffordshire and Worcestershire Canal) the SU is part of an important circular and rural holiday route called the Four Counties Ring. The SU main line was the last trunk narrow canal route to be built in England. It was not completed until 1835 and was the last major civil engineering accomplishment of
Llangollen of 4,079. Today Llangollen relies heavily on the tourist industry, but still gains substantial income from farming. Most of the farms in the hills around the town were sheep farms, and the domestic wool industry, both spinning and weaving, was important in the area for centuries. Several factories were later built along the banks of the River Dee, where both wool and cotton were processed. The water mill opposite Llangollen railway station is over 600 years old, and was originally used to grind flour for local farmers. In the late 19th century, Llangollen had a weekly newspaper, the "Llangollen Advertiser".