Llangollen Canal has 19 stone arches, each with a 45-foot (14 metre) span. Another aqueduct carries the canal over the River Ceiriog at Chirk, and there are tunnels nearby at Whitehouses, Chirk, and Ellesmere. The canal also forms the boundary on two sides of the Fenn's, Whixall and Bettisfield Mosses National Nature Reserve. In 2009 an eleven-mile section of the canal from Gledrid Bridge near Rhoswiel through to the Horseshoe Falls, which includes Chirk Aqueduct and Pontcysyllte Aqueduct, was declared a World Heritage site by UNESCO. The canal at Hurleston Junction rises from the Shropshire Union Canal main line, through four adjacent
Llangollen 1201, under the patronage of Madog ap Gruffydd Maelor of Castell Dinas Brân. The bridge at Llangollen was built across the Dee in the 16th century to replace a previous bridge built in about 1345 by John Trevor, of Trevor Hall (later Bishop of St Asaph), which replaced an even earlier bridge built in the reign of King Henry I. In the 1860s the present bridge was extended by adding an extra arch (to cross the new railway) and a two-storey stone tower with a castellated parapet. This became a café before being demolished in the 1930s to improve traffic