Hive of activity on a sunny day the Horseshoe Falls (Welsh: Rhaeadr y Bedol is a weir on the River Dee near Llantysilio Hall in Denbighshire, Wales, about 5 kilometres (3 mi) north-west of the town of Llangollen.
The distinctively shaped weir, which is 460 feet (140 m) long, helps create a pool of water that can enter the Llangollen Canal (via an adjacent valve house and flow meter). The canal west of Pontcysyllte Aqueduct and the construction of the weir were authorised by an Act of Parliament obtained in 1804 by the Ellesmere Canal Company. The canal was a navigable feeder, which supplied water to the Ellesmere Canal beyond Pontcysyllte, and to the Chester Canal, to which it connected near Nantwich. Thomas Telford was the civil engineer responsible for the design, and the canal and feeder were completed in 1808