a town of Wales, in Denbighshire, is situated in a narrow valley watered by the Dee, on the high road between Holyhead and London, distant 184 miles from the capital. The town, mean and irregular in appearance, with streets narrow and ill-paved, is a favourite resort of tourists. Spanning the River Dee is a bridge of four narrow angular arches, built by Dr Trevor, Bishop of St Asaph, about the middle of the fourteenth century, and long remembered among the "seven wonders of Wales." On the summit of a high conical hill, about a mile from the town, stand the imposing ruins of Castell Dinas Brân or Crow Castle, a fortress of very ancient date. The remains of Valle Crucis Abbey, or Llan Esgoseid, founded about 1200, is 2 miles N.W. of Llangollen. In a meadow near the abbey stands Elisey's Pillar, a round column covered with an ancient inscription of the seventh century, now illegible. The Ellesmere Canal is carried across the valley of Llangollen, and crosses the Dee about 4 miles from the town, by the Pont-y-Cysyllte aqueduct of 19 arches and 126 feet in height. Its length is 1009 feet. The population are chiefly employed in manufacturing woollen and flannel stuffs, and in quarrying stone and lime. Llangollen is a polling-place for the county, and has a market every Saturday. Pop. of parish (1851) 5260.